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Male William de Mortaigne Earl of Cornwall Click to view William de Mortaigne Earl of Cornwall in the family tree

William was born about 1068 in ,Cornwall,England.1   William's father was Robert Count de Mortaigne and his mother was Maude De MONTGOMERY.  His paternal grandparents were Harlevin (Herlouin) Viscomte de Conteville and Harlette de Falaise; his maternal grandparents were Roger V de Montgomery Earl of Arundel and Mabel d' Talvas [Countess of Shr. He had a brother and four sisters, named William De Burgo De, Agnes de, Emma de, Denise De and Cornwall.  He was the youngest of the six children.  He died in 1140.1 


William's family with Isabel Fitz Richard de Clare

They had a son and a daughter, named Aldhelm de Burgo and Beatrice.

1 SKC62001
Further source/citation:
{Jones, Shanna Sullivan}

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