Brick castles are less common in England than stone or earth and timber constructions; when brick was chosen as a building material it was often for its aesthetic appeal or because it was fashionable. The trend for using bricks was introduced by Flemish weavers. There was plenty of stone available nearby, but Cromwell chose to use brick. About 700,000 bricks were used to build the castle, which has been described as "the finest piece of medieval brick-work in England".
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