Mark Horton discovers how William the Conqueror taught the English how to construct castles and why William looked to Normandy for the Tower of London's stone.
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Mark Horton discovers how William the Conqueror taught the English how to construct castles and why William looked to Normandy for the Tower of London's stone.
BBC Two is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.
