A castle is a type of fortified structure, developed in Europe during the
Middle Ages. The first castles appeared in
France in the 10th century, and in England during the 11th century. A few castles are known to have been built in England before the
Normans invaded in 1066; a great many were built in the years following, the principal mechanism by means of which the Normans were able to consolidate their control over the country. Whilst a few important castles, such as the
White Tower in the
Tower of London, were built of stone, most early castles were
motte-and-bailey castles of earthwork and timber, which could be constructed quickly. Some were later rebuilt in stone, but there are a great many castle sites in England where all that is visible today are traces of earthworks. Castles continued to be built in England for several hundred years, reaching a peak of military sophistication in the late 13th century. The two principal elements in their construction were the great tower or
keep, such as the White Tower, and the fortified enclosure, such as is provided by the outer wall of the Tower of London. During the 14th century, largely as a result of the decline of
feudalism, the construction of strong castles began to decline, in favour of more lightly fortified structures often described as
fortified manor houses. In the far north of England, where conditions remained unsettled, fortified buildings continued to be built as late as the 16th century, not only by the rich and powerful but by any with adequate means, as defence not against great armies, but against the notorious
Border Reivers. Many took the form of the
pele tower, a smaller, more modest version of the castle keep, and many of these still survive, often incorporated in later buildings. , Cornwall: a 16th-century Henrician Castle Castles differed from earlier fortifications in that they were generally private fortified residences. Typically, a castle was the residence of a feudal lord, providing the owner with a secure base from which to control his lands, and also a symbol of wealth and power. Earlier fortified structures, such as the Saxon
burh or the
Iron Age hillfort, provided public or communal defences, as did medieval town or
city walls. The many
Roman forts of which ruins survive in Britain differed in being wholly military in nature; they were camps or strongholds of the
Roman army. The Romans also built town or city walls in England, which can still be seen, for instance at
Silchester. By the 16th century the role of fortifications had changed once more with the development of artillery capable of breaching even thick stone walls. In the reign of
Henry VIII, fears of invasion led to the building of a series of new fortresses along the south coast of England, known as the
Device Forts or
Henrician Castles. These were designed to use and to defend against artillery, and since they were not private residences, but national fortifications, they do not possess what architectural historians have come to see as the defining characteristics of a castle. Nonetheless, they are visibly castle-like, being compact, with battlemented walls, squat turrets and sometimes a keep; and they were the last generation of fortresses in England to be known as castles, long before architectural historians began to argue that they should not be. One of them,
Pendennis Castle, was one of the last Royalist strongholds to fall to the Parliamentarians during the
English Civil War—starvation forcing surrender after a siege of five months. , East Sussex As the role of the castle as a fortress declined in the later medieval period, its role as a residence increasingly became the more important. Castles such as
Herstmonceux were built with fortifications seemingly designed more for show than for strength, implying a further evolution in the role and concept of the castle, becoming less a means of enforcing power but instead a symbol of its possession, a castle becoming a grand residence proclaiming the status of its owner. Once fortifications had become altogether redundant, it became increasingly rare in England for new buildings to be described as castles, in contrast to France, where country houses continued to be known as
châteaux. Once no longer needed as fortresses, castles – if they were not abandoned – were, over the centuries, adapted and modernised to make them more suitable for continued use as residences: large windows were inserted in defensive walls, as at
Lumley; outer walls were demolished or lowered to open up views from within, as at
Raby; new residential ranges were built to improve and extend accommodation, as at
Windsor. Some castles were restored after falling into ruin, like
Bamburgh; others, like
Belvoir, were demolished and rebuilt, retaining little or none of the original structure. In the 18th and 19th centuries especially, many castles underwent "improvements" by architects such as
Anthony Salvin, and in this period a fashion developed for entirely new houses to be built in the style of castles, and to be known as castles. Amongst these was
Peckforton Castle, built by Salvin: a building so authentic in its recreation of a medieval castle that it has been described as possibly the last serious fortified home built in Britain. , Cheshire, with
Beeston Castle in the distance ==Scope and exclusions==