Key term for AQA GCSE History, used in Medieval England: Reign of Edward I (1272–1307).
A highly defensible architectural layout featuring an inner wall higher than the outer curtain wall, allowing multi-layered defensive fire.
Concentric design appears in AQA GCSE History revision content for British Depth Studies, especially Medieval England: Reign of Edward I (1272–1307) and Invasion of Wales.
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