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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 de Burgo of Mortain and his mother was Matilda de Montgomery.  His paternal grandparents were Herlevin (Herluin) de Conteville and Herleva de Falaise; his maternal grandparents were Roger II de Montgomery and Mabel Talvas de Alencon-Belleme. He had three sisters named Agnes, Emma de Burgo and Denise.  He is the youngest of the four children.


William's family with Isabel FitzRichard de Clare

They have a son named Aldhelm de Burgo.

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