At the end of the Middle Ages, castles began to lose their military function, but not their psychological impact as a symbol of authority. Gun powder and cannons supported armies of mercenary troops, and the garrison forts built to house them adopted the crenellated walls of private aristocratic castles. By the sixteenth century, professional soldiers lived in barracks, a few officers and the governor had finer quarters, and kings and nobles merely directed the operations from distant palaces where battlements had become purely symbolic decoration. The Battle of Crecy between France and England in 1346 is traditionally considered to be the first use of cannons on the battlefield. At first the noise and smoke created by the explosion terrified horses and men, and wreaked more havoc than the projectiles. Early cannons could be more dangerous for the gunners than for the enemy, but military engineers rapidly developed the weapons’ power and accuracy. A castle’s high walls and towers made easy targets for gunners whose power and accuracy reduced once formidable medieval buildings to rubble. Mining became more successful because the attackers could put explosives under the walls.

Just as towers and crenellations indicated a building’s status, so the crenellated wall signified a castle in the visual arts and in that distinctive medieval sign language known as heraldry. The heraldic symbol of the kingdom of Castile, for example, consisted of a wall and three crenellated towers. This simple composition was easily recognized and reproduced.

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Whether looming over the land as a symbol of a ruler’s authority or providing a setting for displays of wealth and power in spectacular feasts and tournaments, castles made a visual statement about their owners. All ar chitecture has symbolic overtones, and the castle is a potent image.

A sharp contrast existed between the upper classes who constantly moved from manor to manor and the peasants who were tied to the land and lived in agricultural villages outside the castle walls. Yet economic opportunities expanded for both groups.

Castles continued to be the focus of economic activity as the center of an agricultural domain. Wealth continued to be measured in land and its produce. The only access the lord had to his wealth was to move from one estate to another consuming products from the harvests. Housing and feeding a household including retainers and servants required vasts amount of food and space for food preparation.

Castles were more than military posts; they were the centers of political and economic power. As government headquarters they were built to impress the local population as well as visitors and rivals. While power was spread among great tenants-in-chief in a system of delegated government, castles in each territory were places where local lords collected taxes, settled disputes, and administered justice.

Constant warfare, especially against the Muslims, gave rise to a new type of military man—one who combined the character and role of both monk and warrior. These knights, organized into military orders, served officially under the Pope but were essentially independent. Their grand master was both an abbot and a general. They lived under a modified Cistercian rule, and they took monastic vows of obedience, poverty, and chastity. As monks, in theory they owned nothing; for example, their horses and armor were loaned to them by the order. In practice they became a wealthy and often arrogant standing army. Having studied Byzantine and Muslim castles and warfare, they built huge castles that changed castle design in Europe.

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Chateau Gaillard had utilized the last of the newly built, huge great towers, and Rochester had depended on its early twelfth-century tower. During the course of the thirteenth century defense shifted to a towered wall, the enceinte or enclosure castle. Two plans emerged: the castle could rely on a series of courtyards, which had to be taken one after another, or on a concentric defense in which a second wall entirely surrounded the inner wall.

Richard the Lion Hearted, who became king of England in 1189, had inherited Aquitaine (western France) from his mother Eleanor and Normandy and Anjou—and England—from his father Henry. As Duke of Normandy and Anjou, Richard was a vassal of the king of France, but he controlled more land in France than did the French king. Although Richard had been an ally of Philip Augustus in the Third Crusade, in 1192 he went to war with the king over his French lands. Richard built Chateau Gaillard (he called it the “cocky castle”) on a cliff above the Seine north of Paris to defend his claims to Normandy. (...) Richard chose an excellent site, in the territory of the archbishop of Rouen, who objected strenuously until Richard paid him a handsome sum for the land. (...) Richard also raised money by selling rights of citizenship to residents of the town.

When an attacking force laid siege to a castle, they used techniques and weapons not unlike those developed by the ancient Romans. First they surrounded the castle in order to cut off all avenues of escape and resupply. They also built a camp ringed by ditches and palisades to secure their own position. Then they built siege engines—great stonethrowing devices—which they hoped would break down the castle walls. Although the knights’ chivalric code gave pride of place in warfare to a charge on horseback with lance or to hand-to-hand combat with swords, military engineers skilled in the mechanics of offensive engines had to first break through the walls. To breach the walls the army used battering rams, various kinds of projectiles, and mines. In other words they tried to go through, over, or under the walls.

The siege warfare of the Middle Ages consisted of blockading the castle in hopes of destroying it or taking it over for one’s own use. In peacetime castles controlled the surrounding land, but when hostilities broke out they provided passive resistance and served as a base of operations.

Warfare had become endemic in eleventh- and twelfth-century Europe. Castle building used up the resources of the land as every landholder from the king and great nobles to the small landholders fortified their dwellings. Constant skirmishing, brigandage, and open warfare at home and abroad meant that people poured vast resources into training and equipping warriors and building castles and siege machines. The motte and bailey castle with its great tower, as the keep or donjon is called in medieval documents, was admirably suited as a defense against local skirmishes.

As castle design evolved, the great tower was eventually replaced by walled enclosures, which permitted more effective use of troops and better living conditions. The future of castle design lay with the curtain wall, that is, a wall “hung” like a curtain between towers, each of which functioned like a keep.

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By the time Henry II Plantagenet (r. 1154–89) was crowned king of England in 1154, baronial castles outnumbered royal castles. A tough, dynamic ruler, Henry began to rectify the situation at once. In the north, King Malcolm of Scotland surrendered to him, giving Henry significant castles in Scotland and in the border territory. Many older castles like Windsor were strengthened. At Dover the masonry great tower and fore building were built in the 1180s, and concentric walls with half-round towers were added by Richard the Lion Hearted seventeen years later.

Stone towers appeared early in the Loire River valley. The massive ruin at Langeais, recently dated 992, was once a broad tower with four corner turrets. Today it stands in the park of a fifteenth-century chateau. Not far off, at Loches, the tower is the earliest surviving great tower to combine within its walls a hall, the lord’s chamber, and a chapel. Recent analysis of the wood used in the original building has dated this tower between 1012 and 1035.