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Male William FitzWilliam Click to view William FitzWilliam in the family tree

William was born before 1090.  William's father was Baldwin FitzGilbert de Brionne and his mother is UNKNOWN Emma.  His paternal grandfather was Gilbert Crispin de Brienne and his paternal grandmother is Gunnora d'Aunou de Teuton. He has three brothers and three sisters, named Robert, Viger, Richard, Adelise, Daughter and Daughter. He had three half-brothers named Richard, Robert and William.

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