Keep
A keep is a type of fortified tower built within 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 castles that emerged in Normandy and Anjou during the 10th century; the design spread to England, Portugal, and Southern 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 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 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 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 Vincennes near Paris began a fashion for tall, heavily machicolated fortifications that allowed defenders to target enemies directly below, a trend adopted in Spain most prominently through the Valladolid school of 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 bombards, an early canon. 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 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
Since the 16th century, the English word keep has commonly referred to large towers in castles. 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. The term came to be used for other shell keeps by the 15th century. 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.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. 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. 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.
As a result of this evolution in meaning, the use of the term keep in historical analysis today can be problematic. 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. The 12th-century French came to term them a donjon, from the Latin dominarium "lordship", an angent noun linking the physical structure with the concept of feudal authority. Similarly, medieval Spanish writers called the buildings torre del homenaje, or "tower of homage". In England, donjon turned into dungeon, which initially referred to a keep, rather than to a place of imprisonment.
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. 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.
History
Timber keeps (9th–12th centuries)
The earliest keeps were built as part of motte-and-bailey castles from the 10th century onwards – a combination of documentary and archaeological evidence places the first such castle, built at Vincy, in 979. These castles were initially built by the more powerful lords of Anjou in the late 10th and 11th centuries, in particular Fulk III and his son, Geoffrey II, who built a great number of them between 987 and 1060. 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.File:Donjon chateau a motte saint sylvain.jpg|thumb|upright=1.1|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. Smaller mottes could only support simple towers with room for a few soldiers, whilst larger mottes could be equipped with a much grander keep. 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. These wooden keeps could be protected by skins and hides to prevent them from being easily set alight during a siege.
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." 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". As well as having defensive value, keeps and mottes sent a powerful political message to the local population.
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." 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."
In the Holy Roman Empire, tall, free-standing, wooden, fighting towers called 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. Bergfriede, which take their name from the German for a 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.
Early stone keeps (10th–12th centuries)
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. 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. In some cases the keep and motte were built at the same time with the keep embedded in the motte, as happened at Ascot d'Oilly Castle, while at other castles, such as Lydford and Wareham in England, mottes were a later feature and built around a keep. Starting the construction of the keep at ground level and building the motte around it gave the building greater stability.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. 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 keeps.
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. 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. Some wooden keeps were not converted into stone for many years and were instead expanded in wood, such as at Hen Domen. Nonetheless, stone became increasingly popular as a building material for keeps for both military and symbolic reasons.
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. 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 a year; the keep at Scarborough was not atypical in taking ten years to build. 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.
Norman keeps had four sides, with the corners reinforced by pilaster 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. 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. In some cases the entrance stairs were protected by additional walls and a door, producing a forebuilding. 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 thick, immensely strong, and producing a steady temperature inside the building throughout summer and winter. The larger keeps were subdivided by an internal wall while the smaller versions had a single, slightly cramped chamber on each floor. Usually only the first floor would be vaulted in stone, with the higher storeys supported with timbers.
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. 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, 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. 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 arrowslits began to be introduced.
Nonetheless, many stone Norman keeps made considerable compromises to military utility. Norwich Castle, for example, included elaborate blind arcading on the outside of the building and appears to have had an entrance route designed for public ceremony, rather than for defence. The interior of the keep at Hedingham could certainly have hosted impressive ceremonies and events, but contained numerous flaws from a military perspective. Important early English and Welsh keeps such as the White Tower, Colchester, and Chepstow were all built in a distinctive Romanesque style, often reusing Roman materials and sites, and were almost certainly intended to impress and generate a political effect amongst local people. 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.
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. Shell keeps were sometimes further protected by an additional low protective wall, called a chemise, around their base. Buildings could then be built around the inside of the shell, producing a small inner courtyard at the centre. The style was particularly popular in south-east England and across Normandy, although less so elsewhere. Restormel Castle is a classic example of this development, as is the later Launceston Castle; prominent Normandy and Low Country equivalents include Gisors and the Burcht van Leiden – these castles were amongst the most powerful fortifications of the period. 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.