These changes in defence have been attributed to a mixture of castle technology from the Crusades, such as concentric fortification, and inspiration from earlier defences, such as Roman forts.

Many new castles were polygonal or relied on concentric defence – several stages of defence within each other that could all function at the same time to maximise the castle's firepower. This led to the proliferation of towers, with an emphasis on flanking fire. In the late 12th and early 13th centuries, a scientific approach to castle defence emerged. Early castles often exploited natural defences, lacking features such as towers and arrowslits and relying on a central keep. Many northern European castles were originally built from earth and timber, but had their defences replaced later by stone. Urban castles were used to control the local populace and important travel routes, and rural castles were often situated near features that were integral to life in the community, such as mills, fertile land, or a water source.

Although their military origins are often emphasised in castle studies, the structures also served as centres of administration and symbols of power. These nobles built castles to control the area immediately surrounding them and the castles were both offensive and defensive structures they provided a base from which raids could be launched as well as offered protection from enemies. Over the approximately 900 years that castles were built, they took on a great many forms with many different features, although some, such as curtain walls, arrowslits, and portcullises, were commonplace.Įuropean-style castles originated in the 9th and 10th centuries, after the fall of the Carolingian Empire resulted in its territory being divided among individual lords and princes. Use of the term has varied over time and has been applied to structures as diverse as hill forts and country houses. This is distinct from a palace, which is not fortified įrom a fortress, which was not always a residence for royalty or nobility from a pleasance which was a walled-in residence for nobility, but not adequately fortified Īnd from a fortified settlement, which was a public defence – though there are many similarities among these types of construction. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble. Built in 1385, Bodiam Castle in East Sussex, England, is surrounded by a water-filled moat.Ī castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders.

Castle layout