Quatrefoil keep :
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A shell keep which was usually situated on an artificial motte and consisted of four overlapping circular bastions. The blind angles a the joins of the bastions were covered by bartizans supported on corbels, providing flanking fire rather than vertical defence. The design was derived from a type of French keep, which provided and all round field of fire, and a similar design was later adopted for the artillery forts of the Tudors. Also known as a clover-leaf keep or a four-leafed flower keep.
     

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