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A ringwork is a form of fortified defensive structure, usually circular or oval in shape. Ringworks are essentially motte-and-bailey castles minus the motte. Defences were usually earthworks in the form of a ditch and bank surrounding the site. Ringworks originated in Germany in the 10th century as an early form of medieval castle and at first were little more than a fortified manor house. They appeared in England just prior to the Norman conquest and large numbers were built during the late 11th and early 12th centuries. More elaborate versions comprise a ringwork and bailey, the ringwork replacing the more usual motte and the bailey acting as a military stronghold.〔Darvill, Timothy (2008). ''Oxford Concise Dictionary of Archaeology'', 2nd ed., Oxford University Press, Oxford and New York, p. 386. ISBN 978-0-19-953404-3.〕 A survey published in 1969 identified 198 ringwork castles in England and Wales, with a further 50 sites that were considered to possibly be ringworks. == See also == *Ringfort *Circular rampart 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ringwork」の詳細全文を読む スポンサード リンク
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