David Crouch, The Normans, The History of a Dynasty (Hambledon Continuum, London...

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David Crouch, The Normans, The History of a Dynasty (Hambledon Continuum, London, New York, 2002), p. 46. Cited by Wikipedia. Robert I, Duke of Normandy. https://en.wikipedia.org/wiki/Robert_I%2C_Duke_of_Normandy. Accessed May 5, 2017.

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