The Shell Keep signifies the second phase of the development of Norman Cast

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@Heritage Places, Castles & Architecture
09-Apr-2026 05 am

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 settle before construction could commence. As stability returned to the region and economic and social disruptions became less common, the Norman barons were able to allocate resources and time to reinforce their feudal residences. Castles like Carisbrooke, Lincoln, and Totnes had already incorporated Shell Keeps before the end of the reign of Stephen, while Windsor, Berkeley, Arundel, and several others adopted similar structures shortly thereafter, indicating that the era of the Shell Keep can be broadly dated to the twelfth century. Typically, the Shell Keep is situated on a mound, which may be natural, constructed during its establishment, or an existing motte; however, the majority of these mounds are artificial. The design of the earthwork influenced the shape of the Shell, which can be circular, oval, or, as seen in York and likely Warwick, quatrefoil. Most are polygonal, with sides that are not necessarily equal in length, and few exceed a duodecagon in the number of sides. The diameter ranges from thirty to hundred feet, rarely deviating from this range; the wall thickness measures between ten and twelve feet, with foundations extending four to six feet into the ground. This wall is typically not constructed at the very edge of the plateau but is usually set back a few feet, rising to a height of twenty to thirty feet, with wooden or stone steps on the inner face providing access to the rampart. Shell Keep, however, does not originate inexorably from the twelfth century; rather, after demonstrating its effectiveness, it evolved into an established defensive technique, with Lewes and Durham receiving Shells as recently as the reign of Edward III. #History #Architecture #Castles

[Text-Information-Source: British Castles by Charles Henry Ashdown (1856-1922)] [The book is in the public domain in the United States of America, and possibly other nations.] [Image: Cardiff Castle in Wales; Image-Author: Balazs Bezeczky] [N.B.: Cardiff Castle is an example of Shell Keep] [Image-Source-Link: https://www.pexels.com/photo/cardiff-castle-in-wales-5743993/ ] [License-Link: https://www.pexels.com/license/ ] [Please Also Relate to Original Image URL for More Usage Property and Sharing, Remixing or Attributing the Contents] [This website article means no intellectual appropriation by any way and only wishes to contribute in sharing of knowledge]