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A shell keep is a style of medieval fortification, best described as a stone structure circling the top of a motte. In English castle morphology, shell keeps are perceived as the successors to motte-and-bailey castles, with the wooden fence around the top of the motte replaced by a stone wall. Castle engineers during the Norman period did not trust the motte to support the enormous weight of a stone keep. A common solution was to replace the palisade with a stone wall then build wooden buildings backing onto the inside of the wall. This construction was lighter than a keep and prevented the walls from being undermined, meaning they could be thinner and lighter.

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  • Shell keep
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  • A shell keep is a style of medieval fortification, best described as a stone structure circling the top of a motte. In English castle morphology, shell keeps are perceived as the successors to motte-and-bailey castles, with the wooden fence around the top of the motte replaced by a stone wall. Castle engineers during the Norman period did not trust the motte to support the enormous weight of a stone keep. A common solution was to replace the palisade with a stone wall then build wooden buildings backing onto the inside of the wall. This construction was lighter than a keep and prevented the walls from being undermined, meaning they could be thinner and lighter.
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abstract
  • A shell keep is a style of medieval fortification, best described as a stone structure circling the top of a motte. In English castle morphology, shell keeps are perceived as the successors to motte-and-bailey castles, with the wooden fence around the top of the motte replaced by a stone wall. Castle engineers during the Norman period did not trust the motte to support the enormous weight of a stone keep. A common solution was to replace the palisade with a stone wall then build wooden buildings backing onto the inside of the wall. This construction was lighter than a keep and prevented the walls from being undermined, meaning they could be thinner and lighter. Examples include the Round Tower at Windsor Castle and Clifford's Tower at York Castle. File:Windsor Castle Round Tower.JPG|The shell keep of Windsor Castle was built by Henry II and remodelled in the 19th century. File:York castle exterior.jpg|York Castle's Clifford Tower: A shell keep on a motte File:Clifford Mound Crosssection.jpg|A cross-section of York Castle's shell keep and motte, produced in 1903 by Sir Basil Mott; "A" marks the 20th century concrete underpinnings of the motte; the low walls enclosing the base of the motte are a 19th century addition. File:RestormelCastle.JPG|Restormel Castle built around the motte File:Restormel Castle keep plan - labelled.png|Plan of Restormel Castle
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