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English, B.  (2005, September 22). Forz [Fortibus], William de, count of Aumale (1191x6–1241), magnate. Oxford Dictionary of National Biography. Ed.   Retrieved 9 Dec. 2018, from http://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-29476.