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

William De was born about 1220 in Okehampton, Devonshire, England.  William De's father was Sir Robert De Courtenay Baron Of Okehampton and his mother was Mary De Reviers De Vernon.  His paternal grandparents were Reginald de Courtenay , Baron of Okehampton and Hawise de Courcy , Heiress of Okehampton; his maternal grandparents were William De Vernon 5th Earl Of Devon and Mabel (Maud) De Beaumont [Countess Of Dev. He had two sisters named Hawise De and Egeline De.  He was the oldest of the three children.

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