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Described as 'probably the best one that there is' about the Battle of Hastings, published in 2002. Multiple quotes are taken from this book throughout the episode discussing the battle's details and tactics.

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Referenced as Freeman's 'great six-volume history of the Norman Conquest' - Freeman was the Regis Professor of History at Oxford in the late 19th century. His third volume recounts the Battle of Hastings.

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Explicitly mentioned as 'Mark Morris, in his book on the Norman Conquest' when discussing reasons why William might not have wanted the brutal details of Harold's death proclaimed.

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Referenced when discussing how William's stumbling upon landing in England echoes a similar scene from this classical work where Julius Caesar does the same thing.