The Shell Keep signifies the second phase of the development of Norman Castle, comprising a circular or polygonal stone wall constructed on the motte, where the wooden palisade once stood. The transition from a perishable material to masonry was a logical progression; however, the urgency of events following the Conquest left no opportunity to establish such a fortification. Additionally, a hastily assembled mound would not support the necessary weight, necessitating a period for the earth to se ... (Read More)