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A good example of the square keep is the White Tower, also known as the Great Tower and part of the Tower of London.

Built by William the Conquerer on the Thames north bank, construction began in 1078 and was completed in 1097. It is certainly the best-known square keep in Britain.

Its walls range in thickness from 15 ft (4.6m) at the base to just under 11ft (3.3m) at the top.

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15y ago

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