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Castle - Tower of London - Ep 1 - © Discovery Civilisation

Medieval historian Marc Morris travels the length of Britain to tell the story of the nation's castles, consulting the Bayeux Tapestry and archaeological evidence to discover how they evolved over a 600-year period, and revealing that the traditional motte and bailey-style constructions were actually of foreign invention, developed by William the Conqueror and with the episode ending with the building of stone castles that includes the notorious Tower of London. © Discovery Civilisation