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The Gesta Normannorum Ducum of William of Jumièges, Orderic Vitalis, and Robert ...
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The Gesta Normannorum Ducum of William of Jumièges, Orderic Vitalis, and Robert of Torigni, Ed. & Trans. Elisabeth M.V. Van Houts (Clarendon Press, Oxford, 1992), pp. 56-7 n. 1. Cited in Wikipedia