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

William De was born in 1080 in Cardinan, Cornwall, England.  William De's father was Robert De Mortaigne and his mother was Maud De Montgomery.  His paternal grandparents were Harlevin Herluin Conteville and Arlette Herleve De Falaise; his maternal grandparents were Roger De Montgomery and Mabel De Talvas D'Alencon. He had three sisters named Agnes De, Denise De and Emma De.  He was the youngest of the four children. He had a half-sister named Miss De.  He died at the age of 60 in 1140.  He was buried in Lord Of Cardinan.


William De's family with Isabel Fitzrichard De Clare

They had a son named Aldelin Aldhelm De.

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