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Male William de Breteuil Click to view William de Breteuil in the family tree

William was born before 1066.  William's father was William FitzOsbern de Breteuil and his mother was Adeliza de Toeni.  His paternal grandparents were Osbern FitzHerfast de Crepon of Normandy and Emma de Ivry; his maternal grandparents were Roger I the Spaniard de Toeni and Godeheut Borell of Barcelona. He has a brother and a sister, named Roger and Emma FitzOsbern.  He is the youngest of the three children.

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