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Male William De Mortaigne Click to view William De Mortaigne in the family tree

William was born before 1084.  William's father was Robert of Mortain and his mother was Maud De Montgomery.  His paternal grandparents were Herluin de Conteville and Herleve of Falasia; his maternal grandparents were Robert "The Great" of Montgomery and Mabille de Belleme de Alencon. He had two sisters named Agnes and Emma de Burgo.  He was the youngest of the three children.

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