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{{Short description|Fortified tower built in the Middle Ages}} {{other uses}} {{Redirect2|Donjon|Castle keep|other uses of Donjon|Donjon (disambiguation)|the film|Castle Keep}} {{good article}}
[[File:Rochester_zamek_fc11_(cropped).jpg|thumb|The [[Norman architecture|Norman]] ({{circa|1126}}) keep of [[Rochester Castle]], England (rear). The shorter rectangular tower attached to the keep is its [[wikt:forebuilding|forebuilding]], and the [[Curtain wall (fortification)|curtain wall]] is in the foreground.<ref>{{National Heritage List for England|num=1336100|short=yes}}</ref>]]
A '''keep''' is a type of [[fortified tower]] built within [[Castle|castles]] during the [[Middle Ages]] by European [[nobility]]. Scholars have debated the scope of the word ''keep'', but usually consider it to refer to large towers in castles that were fortified residences, used as a refuge of last resort should the rest of the castle fall to an adversary. The first keeps were made of timber and formed a key part of the [[Motte-and-bailey castle|motte-and-bailey castles]] that emerged in [[Normandy]] and [[County of Anjou|Anjou]] during the 10th century; the design spread to England, Portugal,<ref>Barroca (1991), p. 121</ref> south Italy and Sicily. As a result of the [[Norman Conquest]] of England in 1066, use spread into Wales during the second half of the 11th century and into Ireland in the 1170s. The Anglo-Normans and French rulers began to build stone keeps during the 10th and 11th centuries, including Norman keeps, with a square or rectangular design, and circular [[Shell keep|shell keeps]]. Stone keeps carried considerable political as well as military importance and could take a decade or more to build.

During the 12th century, new designs began to be introduced – in France, [[quatrefoil]]-shaped keeps were introduced, while in England [[Polygon|polygonal]] towers were built. By the end of the century, French and English keep designs began to diverge: [[Philip II of France]] built a sequence of circular keeps as part of his bid to stamp his royal authority on his new territories, while in England castles were built without keeps. In Spain, keeps were increasingly incorporated into both Christian and Islamic castles, although in [[Germany]] tall fighting towers called ''[[Bergfried|bergfriede]]'' were preferred to keeps in the western fashion. In the second half of the 14th century, there was a resurgence in the building of keeps. In France, the keep at [[Château de Vincennes|Vincennes]] near Paris began a fashion for tall, heavily [[Machicolation|machicolated]] designs, a trend adopted in Spain most prominently through the [[Valladolid]] school of Spanish castle design. Meanwhile, tower keeps in England became popular amongst the most wealthy nobles: these large keeps, each uniquely designed, formed part of the grandest castles built during the period.

In the 15th century, the protective function of keeps was compromised by improved [[artillery]]. For example, in 1464 during the [[Wars of the Roses]], the keep of [[Bamburgh Castle]] on the Northumberland coast, previously considered to be impregnable, was defeated with [[Bombard (weapon)|bombards]].<ref>{{cite book|author=Bottomley, Frank|title=The Castle Explorer's Guide|publisher=Crown Publishers|year=1983|isbn=0-517-42172-0|url-access=registration|url=https://archive.org/details/castleexplorersg00bott}}</ref> By the 16th century, keeps were slowly falling out of fashion as fortifications and residences. Many were destroyed in civil wars between the 17th and 18th centuries or incorporated into gardens as an alternative to [[Folly|follies]]. During the 19th century, keeps became fashionable once again, and in England and France, a number were restored or redesigned by Gothic architects. Despite further damage to many French and Spanish keeps during the wars of the 20th century, keeps now form an important part of the tourist and heritage industry in Europe.

== Etymology and historiography ==
[[File:Etampes_Donjon_-_enhanced.png|thumb|A 19th-century reconstruction drawing of the keep at [[Château d'Étampes]] in France]]
Since the 16th century, the English word ''keep'' has commonly referred to large towers in castles.<ref name="DixonP9">Dixon, p.9.</ref> The word originates from around 1375 to 1376, coming from the Middle English term ''kype'', meaning basket or cask, and was a term applied to the [[shell keep]] at [[Guînes]], said to resemble a barrel.<ref>, Kenyon and Thompson, pp.175–6.</ref> The term came to be used for other shell keeps by the 15th century.<ref name="DixonP9" /> By the 17th century, the word keep lost its original reference to baskets or casks and was popularly assumed to have come from the Middle English word ''keep'', meaning to hold or to protect.<ref name="DixonP9" />

Early on, the use of the word ''keep'' became associated with the idea of a tower in a castle that would serve both as a fortified, high-status private residence and a refuge of last resort.<ref>Dixon, pp.9–12; Gondolin, p.103-4.</ref> The issue was complicated by the building of fortified [[Renaissance]] towers in Italy called ''tenazza'' that were used as defences of last resort and were also named after the Italian for ''to hold'' or ''to keep''.<ref name="DixonP9" /> By the 19th century, Victorian historians incorrectly concluded that the etymology of the words "keep" and ''tenazza'' were linked and that all keeps had fulfilled this military function.<ref name="DixonP9" />

As a result of this evolution in meaning, the use of the term ''keep'' in historical analysis today can be problematic.<ref name="KingPP190">King, pp.190–6.</ref> Contemporary medieval writers used various terms for the buildings we would today call keeps. In Latin, they are variously described as ''turris'', ''turris castri'' or ''magna turris'' – a ''tower'', a ''castle tower'', or a ''great tower''.<ref name="KingPP190" /> The 12th-century French came to term them a '''[[Dungeon#Etymology|donjon]]''', from the Latin ''dominarium''<!-- this should be Late Latin ''dominio'', accusative singular ''dominionem'', to be phonologically regular, see [[Dungeon#Etymology]] and [[wikt:dungeon]]; ''dominarium'' is not even attested anywhere, it's a Vulgar Latin reconstruction to explain Old French ''dongier'', whence Modern English ''danger'', not ''donjon''! See [[wikt:danger]]. Compare Online Etymology Dictionary. --> "lordship", linking the keep and feudal authority.<ref name="Liddiard2005P47">Liddiard (2005), p.47.</ref> Similarly, medieval Spanish writers called the buildings ''[[Es:torre del homenaje|torre del homenaje]]'', or "tower of [[Homage (feudal)|homage]]". In England, ''donjon'' turned into ''dungeon'', which initially referred to a keep, rather than to a place of imprisonment.<ref>King, p.190</ref>

While the term remains in common academic use, some academics prefer to use the term ''donjon'', and most modern historians warn against using the term "keep" simplistically.<ref name="KingDixonPP190">King, pp.190–6; Dixon, p.12.</ref> The fortifications that we would today call keeps did not necessarily form part of a unified medieval style, nor were they all used in a similar fashion during the period.<ref name="KingDixonPP190" />

== History ==

=== Timber keeps (9th–12th centuries) ===
The earliest keeps were built as part of [[Motte-and-bailey castle|motte-and-bailey castles]] from the 10th century onwards – a combination of documentary and archaeological evidence places the first such castle, built at [[Les Rues-des-Vignes|Vincy]], in 979.<ref>King, p.38.</ref> These castles were initially built by the more powerful lords of [[County of Anjou|Anjou]] in the late 10th and 11th centuries, in particular [[Fulk III, Count of Anjou|Fulk III]] and his son, [[Geoffrey II, Count of Anjou|Geoffrey II]], who built a great number of them between 987 and 1060.<ref>DeVries, pp.203–4.</ref> [[William the Conqueror]] then introduced this form of castle into England when he invaded in 1066, and the design spread through south Wales as the Normans expanded up the valleys during the subsequent decades.<ref>King, pp.20–1.</ref>
[[File:Donjon_chateau_a_motte_saint_sylvain.jpg|thumb|Reconstructed keep at [[Saint-Sylvain-d'Anjou]] in [[Maine-et-Loire]]]]
In a motte-and-bailey design, a castle would include a mound called a motte, usually artificially constructed by piling up turf and soil, and a bailey, a lower walled enclosure. A keep and a protective wall would usually be built on top of the motte. Some protective walls around a keep would be large enough to have a wall-walk around them, and the outer walls of the motte and the wall-walk could be strengthened by filling in the gap between the wooden walls with earth and stones, allowing it to carry more weight – this was called a ''garillum''.<ref>King, p.55.</ref> Smaller mottes could only support simple towers with room for a few soldiers, whilst larger mottes could be equipped with a much grander keep.<ref name="DeVries, p.209">DeVries, p.209.</ref> Many wooden keeps were designed with a ''bretasche'', a square structure that overhung from the upper floors of the building, enabling better defences and a more sturdy structural design.<ref>King, pp.53–4.</ref> These wooden keeps could be protected by [[Hide (skin)|skins and hides]] to prevent them from being easily set alight during a siege.<ref name="DeVries, p.209" />

One contemporary account of these keeps comes from Jean de Colmieu around 1130, who described how the nobles of the [[Calais]] region would build "a mound of earth as high as they can and dig a ditch about it as wide and deep as possible. The space on top of the mound is enclosed by a palisade of very strong hewn logs, strengthened at intervals by as many towers as their means can provide. Inside the enclosure is a citadel, or keep, which commands the whole circuit of the defences. The entrance to the fortress is by means of a bridge, which, rising from the outer side of the moat and supported on posts as it ascends, reches to the top of the mound."<ref>Toy, p.53.</ref> At [[Durham Castle]], contemporaries described how the keep arose from the "tumulus of rising earth" with a keep reaching "into thin air, strong within and without", a "stalwart house...glittering with beauty in every part".<ref>Kenyon, p.13 citing Armitage 1912: pp.147–8.</ref> As well as having defensive value, keeps and mottes sent a powerful political message to the local population.<ref>Durand, p.17.</ref>

Wooden keeps could be quite extensive in size and, as Robert Higham and Philip Barker have noted, it was possible to build "...very tall and massive structures."<ref>Higham and Barker, p.244.</ref>{{refn|The timber structure of surviving medieval [[bell tower]]s have provided archaeologists with indications of at least some of the architectural techniques available at the time.<ref>Higham and Barker, p.246.</ref>|group=nb}} As an example of what these keeps may have comprised, the early 12th-century chronicler Lambert of Ardres described the wooden keep on top of the motte at the castle of [[Ardres]], where the "...first storey was on the surface of the ground, where were cellars and granaries, and great boxes, tuns, casks, and other domestic utensils. In the storey above were the dwelling and common living-rooms of the residents in which were the larders, the rooms of the bakers and butlers, and the great chamber in which the lord and his wife slept...In the upper storey of the house were garret rooms...In this storey also the watchmen and the servants appointed to keep the house took their sleep."<ref>Brown, p.30.</ref>

In the [[Holy Roman Empire]], tall, free-standing, wooden (later stone), fighting towers called ''[[Bergfried|Bergfriede]]'' were commonly built by the 11th century, either as part of motte-and-bailey designs or, as part of ''Hohenburgen'' castles, with characteristic inner and outer courts.<ref>Kaufmann and Kaufmann, p.109; Purton, p.195.</ref> ''Bergfriede'', which take their name from the German for a [[Bell tower|belfry]], had similarities to keeps, but are usually distinguished from them on account of ''Bergfriede'' having a smaller area or footprint, usually being non-residential and being typically integrated into the outer defences of a castle, rather than being a safe refuge of last resort.<ref>Kaufmann and Kaufmann, pp.123, 306; Thompson (2008), pp.22–3.</ref>{{refn|In practice, smaller keeps are often hard to distinguish from the design of a ''Bergfried'' – it is also worth bearing in mind the lack of clarity of the term ''keep'' when drawing distinctions of this kind.<ref>Kaufmann and Kaufmann, p.306.</ref>|group=nb}}

=== Early stone keeps (10th–12th centuries) ===
{{Multiple image|direction=horizontal|align=right|image1=Colchester castle 800.jpg|image2=Colchester Castle Keep.jpg|width=250|caption2=|caption1=The Norman keep at [[Colchester Castle]] in Essex, built in a [[Romanesque art|Romanesque]] style on the foundations of a Roman temple}} During the 10th century, a small number of stone keeps began to be built in France, such at the [[Château de Langeais]]: in the 11th century, their numbers increased as the style spread through Normandy across the rest of France and into England, South Italy and Sicily.<ref>Nicholson, p.78; Kaufmann and Kaufmann, p.109.</ref> Some existing motte-and-bailey castles were converted to stone, with the keep usually amongst the first parts to be upgraded, while in other cases new keeps were built from scratch in stone.<ref>Brown, p.38.</ref> These stone keeps were introduced into Ireland during the 1170s following the Norman occupation of the east of the country, where they were particularly popular amongst the new Anglo-Norman lords.<ref>McNeill, pp.20, 53.</ref> Two broad types of design emerged across France and England during the period: four-sided stone keeps, known as Norman keeps or great keeps in English – a ''donjon carré'' or ''donjon roman'' in French – and circular [[Shell keep|shell keeps]].<ref>Viollet-le-Duc, p.77.</ref>{{refn|Although medieval writers typically referred to Norman keeps as a ''magna turris'', or ''great tower'', there was no specific contemporary term for a [[shell keep]].<ref>Hulme, p.214.</ref>|group=nb}}

The reasons for the transition from timber to stone keeps are unclear, and the process was slow and uneven, taking many years to take effect across the various regions.<ref name="Brown1962P36">Brown, p.36.</ref> Traditionally it was believed that stone keeps had been adopted because of the cruder nature of wooden buildings, the limited lifespan of wooden fortifications and their vulnerability to fire, but recent archaeological studies have shown that many wooden castles were as robust and as sophisticated as their stone equivalents.<ref>Brown, p.36; Toy (1985), p.54; Creighton and Higham, pp.41–2.</ref> Some wooden keeps were not converted into stone for many years and were instead expanded in wood, such as at [[Hen Domen]].<ref>Creighton and Higham, p.41.</ref> Nonetheless, stone became increasingly popular as a building material for keeps for both military and symbolic reasons.<ref>Liddiard (2005), p.53; King, p.62.</ref>

Stone keep construction required skilled craftsmen. Unlike timber and earthworks, which could be built using [[unfree labour]] or serfs, these craftsmen had to be paid and stone keeps were therefore expensive.<ref name="Pounds1994P20">Pounds, p.20.</ref> They were also relatively slow to erect, due to the limitations of the [[lime mortar]] used during the period – a keep's walls could usually be raised by a maximum of only 12 feet (3.6 metres) a year; the keep at [[Scarborough Castle|Scarborough]] was not atypical in taking ten years to build.<ref name="Pounds1994P20" /> The number of such keeps remained relatively low: in England, for example, although several early stone keeps had been built after the conquest, there were only somewhere between ten and fifteen in existence by 1100, and only around a hundred had been built by 1216.<ref>Hulme, p.213.</ref>

{{Multiple image|direction=horizontal|align=left|image1=Goodrich Castle keep1.jpg|image2=Goodrich keep plan alternative.jpg|width=190|caption1=|caption2=The Norman keep (r) and prison (l) at [[Goodrich Castle]] in [[Herefordshire]], England, built to a square design in the early 12th century}} Norman keeps had four sides, with the corners reinforced by [[pilaster]] [[Buttress|buttresses]]; some keeps, particularly in Normandy and France, had a ''barlongue'' design, being rectangular in plan with their length twice their width, while others, particularly in England, formed a square.<ref>Toy (1985), p.66; Baldwin, p.298.</ref> These keeps could be up to four storeys high, with the entrance placed on the first storey to prevent the door from being easily broken down; early French keeps had external stairs in wood, whilst later castles in both France and England built them in stone.<ref>Toy (198), p.66; King, p.67.</ref> In some cases the entrance stairs were protected by additional walls and a door, producing a forebuilding.<ref name="King">King, p.67.</ref> The strength of the Norman design typically came from the thickness of the keep's walls: usually made of [[rag-stone]], these could be up to 24 feet (7.3 metres) thick, immensely strong, and producing a steady temperature inside the building throughout summer and winter.<ref>Brown, p.45; King, p.68.</ref> The larger keeps were subdivided by an internal wall while the smaller versions had a single, slightly cramped chamber on each floor.<ref>Brown, p.46; Thompson (2008), p.65.</ref> Usually only the first floor would be [[Vault (architecture)|vaulted]] in stone, with the higher storeys supported with timbers.<ref name="King" />

There has been extensive academic discussion of the extent to which Norman keeps were designed with a military or political function in mind, particularly in England. Earlier analyses of Norman keeps focused on their military design, and historians such as R. Brown Cathcart King proposed that square keeps were adopted because of their military superiority over timber keeps. Most of these Norman keeps were certainly extremely physically robust, even though the characteristic pilaster buttresses added little real architectural strength to the design.<ref>King, p.67; Hulme, p.216.</ref> Many of the weaknesses inherent to their design were irrelevant during the early part of their history. The corners of square keeps were theoretically vulnerable to [[siege engines]] and galleried [[Mining (military)|mining]], but before the introduction of the [[trebuchet]] at the end of the 12th century, early artillery stood little practical chance of damaging the keeps, and galleried mining was rarely practised.<ref>Hulme, pp.216, 222.</ref> Similarly, the corners of a square keep created dead space that defenders could not fire at, but missile fire in castle sieges was less important until the introduction of the [[crossbow]] in the middle of the 12th century, when [[Arrowslit|arrowslits]] began to be introduced.<ref>Hume, p.217.</ref>

{{Multiple image|direction=horizontal|align=right|image1=RestormelCastle.JPG|image2=Restormel Castle keep plan.jpg|width=210|caption2=|caption1=[[Restormel Castle]]'s [[shell keep]] in [[Cornwall]], England, converted to stone in the late 12th century}} Nonetheless, many stone Norman keeps made considerable compromises to military utility.<ref>Liddiard (2005), pp.51–2.</ref> [[Norwich Castle]], for example, included elaborate [[Blind arcade|blind arcading]] on the outside of the building and appears to have had an entrance route designed for public ceremony, rather than for defence.<ref>Liddiard (2005), p.51.</ref> The interior of the keep at [[Hedingham Castle|Hedingham]] could certainly have hosted impressive ceremonies and events, but contained numerous flaws from a military perspective.<ref>Liddiard (2005), p.53.</ref> Important early English and Welsh keeps such as the [[White Tower (Tower of London)|White Tower]], [[Colchester Castle|Colchester]], and [[Chepstow Castle|Chepstow]] were all built in a distinctive [[Romanesque architecture|Romanesque]] style, often reusing Roman materials and sites, and were almost certainly intended to impress and generate a political effect amongst local people.<ref>Liddiard (2005), p.34; Pettifer (2000a), p.xiii; Turner, p.27.</ref> The political value of these keep designs, and the social prestige they lent to their builders, may help explain why they continued to be built in England into the late 12th century, beyond the point when military theory would have suggested that alternative designs were adopted.<ref>Liddiard (2005), p.48; King, p.73.</ref>

The second early stone design, emerging from the 12th century onwards, was the [[shell keep]], a ''donjon annulaire'' in French, which involved replacing the wooden keep on a motte, or the palisade on a [[ringwork]], with a circular stone wall.<ref>Brown, p.42; Durand, p.29.</ref> Shell keeps were sometimes further protected by an additional low protective wall, called a [[Chemise (wall)|chemise]], around their base. Buildings could then be built around the inside of the shell, producing a small inner courtyard at the centre.<ref name="Brown1962P42">Brown, p.42.</ref> The style was particularly popular in south-east England and across Normandy, although less so elsewhere.<ref>Durand, p.29, Toy (1933) cited Creighton, p.49.</ref> [[Restormel Castle]] is a classic example of this development, as is the later [[Launceston Castle]]; prominent Normandy and Low Country equivalents include [[Château de Gisors|Gisors]] and the [[Burcht van Leiden]] – these castles were amongst the most powerful fortifications of the period.<ref>Brown, p.41; Toy (1985), pp.58–9; Viollet-le-Duc, p.83.</ref> Although the circular design held military advantages over one with square corners, as noted above these really mattered from only the end of the 12th century onwards; the major reason for adopting a shell keep design, in the 12th century at least, was the circular design of the original earthworks exploited to support the keep; indeed, some designs were less than circular in order to accommodate irregular mottes, such as that found at [[Windsor Castle]].<ref name="Hulme, p.222">Hulme, p.222.</ref>

=== Mid-medieval keeps (late 12th–14th centuries) ===
{{Multiple image|direction=horizontal|align=right|image1=Etampestour1.jpg|image2=Chateau D'Etampes keep plan.png|width=170|caption2=Keep at [[Château d'Étampes]] in France, a curved design begun in 1120}}

During the second half of the 12th century, a range of new keep designs began to appear across France and England, breaking the previous unity of the regional designs. The use of keeps in castles spread through Iberia, but some new castles never incorporated keeps in their designs. One traditional explanation for these developments emphasises the military utility of the new approaches, arguing, for example, that the curved surfaces of the new keeps helped to deflect attacks, or that they drew on lessons learnt during the Crusades from Islamic practices in the Levant.<ref>Brown, pp.53–4; King, p.81.</ref> More recent historical analysis, however, has emphasised the political and social drivers that underlay these mid-medieval changes in keep design.<ref>Liddiard (2005), pp.6–7.</ref>

Through most of the 12th century, France was divided between the Capetian kings, ruling from the [[Île-de-France]], and kings of England, who controlled Normandy and much of the west of France. Within the Capetian territories, early experimentation in new keep designs began at [[Donjon de Houdan|Houdan]] in 1120, where a circular keep was built with four round turrets; internally, however, the structure remained conventionally square.<ref>King, p.98; Gondoin, p.156.</ref> A few years later, [[Château d'Étampes]] adopted a [[quatrefoil]] design.<ref>King, p.99.</ref>{{refn|Étampes may have influenced the later [[quatrefoil]] design of the keep at [[York Castle]].<ref>Butler, p.16.</ref>|group=nb}} These designs, however, remained isolated experiments.

In the 1190s, however, the struggle for power in France began to swing in favour of [[Philip II of France|Philip II]], culminating in the Capetian capture of Normandy in 1204. Philip II started to construct completely circular keeps, such as the [[Rouen Castle#Tour Jeanne d'Arc|Tour Jeanne d'Arc]], with most built in his newly acquired territories.<ref>King, p.100; Baldwin, p.298; Châtelain, p.303.</ref> The first of Philip's new keeps was begun at the [[Louvre]] in 1190 and at least another twenty followed, all built to a consistent standard and cost.<ref>Baldwin, p.299.</ref> The architectural idea of circular keeps may have come from [[Catalonia]], where circular towers in castles formed a local tradition, and probably carried some military advantages, but Philip's intention in building these new keeps in a fresh style was clearly political, an attempt to demonstrate his new power and authority over his extended territories.<ref>Durand, pp.29, 57; Gondoin, p.156.</ref> As historian Philippe Durand suggests, these keeps provided military security and were a physical representation of the ''renouveau capétien'', or Capetian renewal.<ref>Durand, p.59.</ref>

{{Multiple image|direction=horizontal|align=left|image1=Trim Castle Gesamt.jpg|image2=Trim keep plan.png|width=190|caption1=Keep at [[Trim Castle]] in Ireland, an angular design built in the late 12th century}} Keep design in England began to change only towards the end of the 12th century, later than in France.<ref name="King1991P77">King, p.77.</ref> Wooden keeps on mottes ceased to be built across most of England by the 1150s, although they continued to be erected in Wales and along the [[Welsh Marches]].<ref>Pounds, p.21.</ref> By the end of the 12th century, England and Ireland saw a handful of innovative angular or polygonal keeps built, including the keep at [[Orford Castle]], with three rectangular, clasping towers built out from the high, circular central tower; the cross-shaped keep of [[Trim Castle]] and the famous polygonal design at [[Conisborough Castle|Conisborough]].<ref>Brown, pp.52–3; Heslop, pp.279, 289; Anderson, p.113; Hull, p.142.</ref> Despite these new designs, square keeps remained popular across much of England and, as late as the 1170s, square Norman great keeps were being built at [[The Castle, Newcastle|Newcastle]].<ref>Anderson, pp.114–6.</ref> Circular keep designs similar to those in France really became popular in Britain in the Welsh Marches and Scotland for only a short period during the early 13th century.<ref>King, pp.81–2.</ref>

As with the new keeps constructed in France, these Anglo-Norman designs were informed both by military thinking and by political drivers. The keep at Orford has been particularly extensively analysed in this regard, and although traditional explanations suggested that its unusual plan was the result of an experimental military design, more recent analysis concludes that the design was instead probably driven by political symbolism and the need for Henry to dominate the contested lands of [[East Anglia]].<ref name="Liddiard2005P47" /> The architecture would, for mid-12th century nobility, have summoned up images of King Arthur or [[Constantinople]], then the idealised versions of royal and imperial power.<ref>Heslop, p.288-9.</ref> Even formidable military designs such as that at Château Gaillard were built with political effect in mind.<ref name="LiddiardP54">Liddiard (2005), p.54.</ref> Gaillard was designed to reaffirm Angevin authority in a fiercely disputed conflict zone and the keep, although militarily impressive, contained only an anteroom and a royal audience chamber, and was built on soft chalk and without an internal well, both serious defects from a defensive perspective.<ref name="LiddiardP54" />

During most of the medieval period, Iberia was divided between Christian and Islamic kingdoms, neither of which traditionally built keeps, instead building watchtowers or mural towers.<ref>Tuulse, p.74; Burton, p.230.</ref> By the 12th century, however, the influence of France and the various [[Military order (society)|military orders]] was encouraging the development of square keeps in Christian castles across the region, and by the second half of the century this practice was spread across into the Islamic kingdoms.<ref>Tuulse, p.74; Burton, p.236; Anderson, p.151.</ref>

{{Multiple image|direction=horizontal|align=right|image1=Rouen - Tour Jeanne d'Arc 01.jpg|image2=Plan.donjon.chateau.Rouen.ground.png|width=170|caption1=|caption2=Tour Jeanne d'Arc at [[Rouen Castle]] in [[Normandy]], France, a circular design built in 1204}} By contrast, the remainder of Europe saw stone towers being used in castles, but not in a way that fulfilled the range of functions seen in the western European keeps. In the Low Countries, it became popular for the local nobility to build stand-alone, square towers, but rarely as part of a wider castle.<ref>Purton, p.94.</ref> Similarly, square stone towers became popular in Venice, but these did not fulfil the same role as western keeps.<ref>Schulz, p.7.</ref> In Germany, rectangular stone castles began to replace motte-and-bailey castles from the 12th century onwards.<ref name="TaylorP7">Taylor, p.7.</ref> These designs included stone versions of the traditional ''Bergfriede'', which still remained distinct from the domestic keeps used in more western parts of Europe, with the occasional notable exception, such as the large, residential ''Bergfried'' at [[Eltville Castle]].<ref name="TaylorP7" />

Several designs for new castles emerged that made keeps unnecessary. One such design was the [[Concentric castle|concentric]] approach, involving exterior walls guarded with towers, and perhaps supported by further, concentric layered defenses: thus castles such as [[Framlingham Castle|Framlingham]] never had a central keep. Military factors may well have driven this development: R. Brown, for example, suggests that designs with a separate keep and bailey system inherently lacked a co-ordinated and combined defensive system, and that once bailey walls were sophisticated enough, a keep became militarily unnecessary.<ref>Brown, pp.62, 72.</ref> In England, [[Gatehouse|gatehouses]] were also growing in size and sophistication until they too challenged the need for a keep in the same castle. The classic [[Edward I of England|Edwardian]] gatehouse, with two large, flanking towers and multiple portcullises, designed to be defended from attacks both within and outside the main castle, has been often compared to the earlier Norman keeps: some of the largest gatehouses are called gatehouse keeps for this reason.<ref>Pettifer (2000b), p.320; Brown, p.69.</ref>

The [[quadrangular castle]] design that emerged in France during the 13th century was another development that removed the need for a keep. Castles had needed additional living space since their first emergence in the 9th century; initially this had been provided by halls in the bailey, then later by ranges of chambers alongside the inside of a bailey wall, such as at [[Goodrich Castle|Goodrich]]. But French designs in the late 12th century took the layout of a contemporary unfortified manor house, whose rooms faced around a central, rectangular courtyard, and built a wall around them to form a castle.<ref>Gondoin, p.167.</ref> The result, illustrated initially at [[Château de Tanlay|Yonne]], and later at [[Château de Farcheville]], was a characteristic quadrangular layout with four large, circular corner towers. It lacked a keep, which was not needed to support this design.<ref>Châtelain, p.35.</ref>

=== Late medieval keeps (14th–16th centuries) ===
{{Multiple image|direction=horizontal|align=right|image1=Château de Vincennes Paris FRA 002.jpg|image2=Plan of Chateau de Vincennes keep.png|width=170|caption2=|caption1=Keep at the [[Château de Vincennes]] in Paris, completed by 1360 as the heart of a palace fortress}}

The end of the medieval period saw a fresh resurgence in the building of keeps in western castles. Some castles continued to be built without keeps: the [[Bastille]] in the 1370s, for example, combined a now traditional quadrangular design with machicolated corner towers, gatehouses and moat; the walls, innovatively, were of equal height to the towers.<ref>Pounds, pp.265–6.</ref> This fashion became copied across French and in England, particularly amongst the ''[[nouveau riche]]'', for example at [[Nunney Castle|Nunney]]. The royalty and the very wealthiest in France, England and Spain, however, began to construct a small number of keeps on a much larger scale than before, in England sometimes termed tower keeps, as part of new palace fortresses.{{refn|The term "tower house" is also used in the literature to describe this class of building.|group=nb}} This shift reflected political and social pressures, such as the desire of the wealthiest lords to have privacy from their growing households of retainers, as well as the various architectural ideas being exchanged across the region, despite the ongoing [[Hundred Years War]] between France and England.<ref>Emery, p.206; Anderson, p.223.</ref>

The resurgence in French keep design began after the defeat of the royal armies at the battles of [[Battle of Crécy|Crécy]] in 1346 and [[Battle of Poitiers (1356)|Poitiers]] in 1356, which caused high levels of social unrest across the remaining French territories.<ref name="DurandPurtonP81">Durand, p.81; Purton, p.140.</ref> [[Charles V of France]] attempted to restore French royal authority and prestige through the construction of a new range of castles.<ref name="DurandPurtonP81" /> The [[Château de Vincennes]], where a new keep was completed under Charles by 1380, was the first example of these ''palace fortresses''.<ref name="DurandPurtonP81" /> The keep at Vincennes was highly innovative: six stories high, with a ''[[chemin de ronde]]'' running around the [[Machicolation|machicolated]] battlements; the luxuriously appointed building was protected by an ''[[enceinte]]'' wall that formed a "fortified envelope" around the keep.<ref>Durand, p.81; Purton, p.140; Anderson, p.208.</ref> The Vincennes keep was copied elsewhere across France, particularly as the French kings reconquered territories from the English, encouraging a style that emphasised very tall keeps with prominent machicolations.<ref>Purton, p.141.</ref> No allowance for the emerging new gunpowder weapons was made in these keeps, although later in the century [[Gunport|gunports]] were slowly being added, as for example by [[Charles VI of France|Charles VI]] to his keep at [[Saint-Malo]].<ref>Purton, p.141, 270.</ref>

{{Multiple image|direction=horizontal|align=left|image1=Penafiel-Espana0007.JPG|image2=Penafiel_castle_keep_rotated.png|width=190|caption2=|caption1=Keep at [[Peñafiel Castle]] in Spain, built in the mid-15th century}} The French model spread into Iberia in the second half of the century, where the most powerful nobles in [[Kingdom of Castile|Castile]] built a number of similar tall keeps, such as that at [[Peñafiel Castle|Peñafiel]], taking advantage of the weakness of the Castilian Crown during the period.<ref>Anderson, p.237.</ref> [[Henry IV of Castile]] responded in the 15th century by creating a sequence of royal castles with prominent keeps at the [[Castle of La Mota]], [[Portillo, Valladolid|Portillo]], and [[Alcázar of Segovia]]: built to particular proportions, these keeps became known as a key element of the Valladolid school of Spanish castle design.<ref name="KaufmanKaufmanP284">Kaufmann and Kaufmann, p.284.</ref> Smaller versions of these keeps were subsequently built by many aspiring new aristocracy in Spain, including many converted [[Jew|Jews]], keen to improve their social prestige and position in society.<ref name="KaufmanKaufmanP284" /> The French model of tall keeps was also echoed in some German castles, such as that at [[Karlštejn]], although the layout and positioning of these towers still followed the existing ''bergfried'' model, rather than that in western castles.<ref>Anderson, p.174.</ref> An other impressive 15th century metiterenian castle keep is the keep of the [[Kolossi Castle]], in [[Cyprus]], a three floor square keep, 21 meters high. {{Multiple image|direction=horizontal|align=right|image1=KOLOSSI 01.jpg|image2=Κάστρο Κολοσιού κάτοψη.jpg|width=190|caption2=|caption1=Keep at [[Kolossi Castle]] in [[Cyprus]], built in the 1454}}

The 15th and 16th centuries saw a small number of English and occasional Welsh castles develop still grander keeps.<ref>Pounds, p.271; Johnson (2002), p.111.</ref> The first of these large ''tower keeps'' were built in the north of England during the 14th century, at locations such as [[Warkworth Castle|Warkworth]]. They were probably partially inspired by designs in France, but they also reflected the improvements in the security along the Scottish border during the period, and the regional rise of major noble families such as the [[Henry Percy, 1st Earl of Northumberland|Percies]] and the [[House of Neville|Nevilles]], whose wealth encouraged a surge in castle building at the end of the 14th century.<ref>Emery, pp.14–5.</ref> New castles at [[Raby Castle|Raby]], [[Bolton Castle|Bolton]], and Warkworth Castle took the quadrangular castle styles of the south and combined them with exceptionally large tower keeps to form a distinctive, northern style.<ref>King, pp.152–3.</ref> Built by major noble houses, these castles were typically even more opulent than the smaller castles like Nunney, built by the ''nouveau riche''.<ref>King, p.152.</ref> They marked what historian Anthony Emery has described as a "...second peak of castle building in England and Wales," following on from the Edwardian designs at the end of the 14th century.<ref>Emery, p.25.</ref>

In the 15th century, the fashion for the creation of very expensive, French-influenced palatial castles featuring complex tower keeps spread, with new keeps being built at [[Wardour Castle|Wardour]], [[Tattershall Castle|Tattershall]], and [[Raglan Castle]].<ref name="Pounds1994P271">Pounds, p.271.</ref> In central and eastern England, some keeps began to be built in brick, with [[Caister Castle|Caister]] and Tattershall forming examples of this trend.<ref>Creighton and Higham, p.54.</ref> In Scotland, the construction of [[Holyrood Palace|Holyrood Great Tower]] between 1528 and 1532 drew on this English tradition, but incorporated additional French influences to produce a highly secure but comfortable keep, guarded by a gun park.<ref>Dunbar, pp.69–70.</ref> These tower keeps were expensive buildings to construct, each built to a unique design for a specific lord and, as historian Norman Pounds has suggested, they "...were designed to allow very rich men to live in luxury and splendour."<ref>Pounds, p.270.</ref> {{Multiple image|direction=horizontal|align=left|image1=Warkworth Castle 2.jpg|image2=Warkworth keep.jpg|width=190|caption2=|caption1=Keep at [[Warkworth Castle]] in [[Northumberland]], England, a large tower keep built during the 1370s}}

At the same time as these keeps were being built by the extremely wealthy, much smaller, keep-like structures called [[Tower house|tower houses]] or [[Peel tower|peel towers]] were built across Ireland, Scotland, and northern England, often by relatively poorer local lords and landowners.<ref>Emery, p.26; Toy (1985), p.225.</ref>{{refn|Although [[tower house]]s are typically associated with smaller landowners, in Scotland larger tower houses were also built by the rich.<ref>Tabraham, p.80.</ref>|group=nb}} It was originally argued that Irish tower houses were based on the Scottish design, but the pattern of development of such castles in Ireland does not support this hypothesis.<ref>Barry, p.223.</ref> A tower house would typically be a tall, square, stone-built, crenelated building; Scottish and Ulster tower houses were often also surrounded by a [[Barmkin|barmkyn]] or [[bawn]] wall.<ref>Toy (1985), p.224; Reid, p.33.</ref> Most academics have concluded that tower houses should not be classified as keeps but rather as a form of fortified house.<ref>Pettifer (2000b), p.320.</ref>

As the 16th century progressed, keeps fell out of fashion once again. In England, the gatehouse also began to supplant the keep as the key focus for a new castle development.<ref name="ThompsonPP73">Thompson (1994), pp.73, 125.</ref> By the 15th century, it was increasingly unusual for a lord to build both a keep and a large gatehouse at the same castle, and by the early 16th century, the gatehouse had easily overtaken the keep as the more fashionable feature: indeed, almost no new keeps were built in England after this period.<ref name="ThompsonPP73" /> The classical [[Palladian]] style began to dominate European architecture during the 17th century, causing a further move away from the use of keeps. Buildings in this style usually required considerable space for the [[Enfilade (architecture)|enfiladed]] formal rooms that became essential for modern palaces by the middle of the century, and this style was impossible to fit into a traditional keep.<ref>Brindle and Kerr, p.50.</ref>{{refn|As Edward Corp has illustrated in the case of the exiled [[James II of England|James II]], operating a modern 17th century court within an older style of building could be extremely challenging.<ref>Corp, p.241.</ref>|group=nb}} The keep at [[Bolsover Castle]] in England was one of the few to be built as part of a Palladian design.<ref>Gomme and Maguire, pp.69–72.</ref>

=== Later use and destruction of keeps (17th–21st centuries) ===
{{Multiple image|direction=horizontal|align=right|image1=The hexagonal Great Tower, Raglan Castle - geograph.org.uk - 1531739.jpg|image2=Raglan keep.png|width=190|caption1=|caption2=The [[slighting|slighted]] keep of [[Raglan Castle]], Wales}}
[[File:Royal_Naval_Dockyard_Bermuda_circa_1899_Ordnance_Survey_map_by_Lieutenant_Arthur_Johnson_Savage,_RE.jpg|thumb|1899 Ordnance Survey map of the fortified [[Royal Naval Dockyard, Bermuda|Royal Naval Dockyard]] (to become the ''North Yard'' on completion of the South Yard, shown then under construction) in the [[Imperial fortress]] [[British Overseas Territory|colony]] of [[Bermuda]], with its Keep at the northern (right) end]]
From the 17th century onwards, some keeps were deliberately destroyed. In England, many were destroyed after the end of the [[Second English Civil War]] in 1649, when Parliament took steps to prevent another royalist uprising by [[slighting]], or damaging, castles so as to prevent them from having any further military utility. Slighting was quite expensive and took considerable effort to carry out, so damage was usually done in the most cost-efficient fashion with only selected walls being destroyed.<ref>Bull, p.134.</ref> Keeps were singled out for particular attention in this process because of their continuing political and cultural importance, and the prestige they lent their former royalist owners – at [[Kenilworth Castle|Kenilworth]], for example, only the keep was slighted, and at [[Raglan Castle|Raglan]], the keep was the main focus of parliamentary activity.<ref>Johnson, p.174.</ref> There was some equivalent destruction of keeps in France in the 17th and 18th centuries, such as the slighting of [[Château de Montaiguillon|Montaiguillon]] by [[Cardinal Richelieu]] in 1624, but the catalogue of damage was far less than that of the 1640s and early 1650s in England.<ref>Châtelain, p.38-9.</ref>

In England, ruined medieval castles became fashionable again in the middle of the 18th century. They were considered an interesting counterpoint to [[Palladian architecture|Palladian classical architecture]], and gave a degree of medieval allure to their owners.<ref>Gerrard, p.16; Creighton, p.85.</ref> Some keeps were modified to exaggerate this effect: [[Hawarden Castle (medieval)|Hawarden]], for example, was remodelled to appear taller but also more decayed, the better to produce a good silhouette.<ref>Pettifer (2000a), p.75.</ref> The interest continued and, in the late 18th and 19th century, it became fashionable to build intact, replica castles in England, resulting in what A. Rowan has called the ''Norman style'' of new castle building, characterised by the inclusion of large keeps; the final replica keep to be built in this way was at [[Penrhyn Castle|Penrhyn]] between 1820 and 1840.<ref>Thompson (1994), p.162, citing Rowan (1952).</ref>

{{Multiple image|direction=horizontal|align=left|image1=Chateau pierrefonds143.jpg|image2=Pierrefonds Donjon Ground Floor Plan.png|width=170|caption1=|caption2=The keep of [[Château de Pierrefonds]], France, rebuilt during the 19th century in a [[Gothic Revival architecture|Gothic Revival]] style}} Where there was an existing castle on a site, another response across 19th-century Europe was to attempt to improve the buildings, bringing their often chaotic historic features into line with a more integrated architectural aesthetic, in a style often termed [[Gothic Revival architecture|Gothic Revivalism]].<ref name="JonesP4">Jones, p.4.</ref> There were numerous attempts to restore or rebuild keeps so as to produce this consistently Gothic style: in England, the architect [[Anthony Salvin]] was particularly prominent – as illustrated by reworking and heightening of the keep at [[Windsor Castle]], while in France, [[Eugène Viollet-le-Duc]] reworked the keeps at castles in locations like [[Château de Pierrefonds|Pierrefonds]] during the 1860s and 1870s, admittedly in a largely speculative fashion, since the original keep had been mostly destroyed in 1617.<ref>Hanser, pp.181–2, 184; Jones, p.4.</ref>

The [[Spanish Civil War]] and [[First World War|First]] and [[Second World War|Second World Wars]] in the 20th century caused damage to many castle keeps across Europe; in particular, the famous keep at [[Château de Coucy|Coucy]] was destroyed by the [[German Army (German Empire)|German Army]] in 1917.<ref>Thompson, rise, p.44.</ref> By the late 20th century the conservation of castle keeps formed part of government policy across France, England, Ireland, and Spain.<ref>Stubbs and Makaš, p.98.</ref> In the 21st century in England, most keeps are in ruins and form part of the [[tourism]] and [[Cultural heritage|heritage]] industries, rather than being used as functioning buildings – the keep of [[Windsor Castle]] being a rare exception. In Germany, large numbers of the ''[[bergfried]]'' towers were restored as functional buildings in the late 19th and early 20th centuries, often as government offices or [[Youth hostel|youth hostels]], or the modern conversion of tower houses, which in many cases have become modernised domestic homes.<ref>Taylor, pp.285–8, 291.</ref>

== See also ==
{{commons category|Keeps}}

* [[Tenshu]], the Japanese castle keep, often wooden
* [[Medieval architecture]]
* Semi-fortified Romanian [[culă]]
* [[Chardak|Čardak]], similar fortifications used by South Slavs

== Notes ==
{{reflist|group=nb}}

== References ==
{{reflist|20em}}

== Bibliography ==
{{Refbegin|30em}}

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{{Refend}}

== Further reading ==
{{scholia|topic}}

* {{citation|first=William|last=Wyeth|title=Medieval Timber Motte Towers|journal=Medieval Archaeology|volume=62|issue=1|pages=135–156|year=2018|doi=10.1080/00766097.2018.1451594|s2cid=165529012}}

{{Fortifications}}

{{Authority control}}