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

William was born about 1219 in Richards Castle, Herefordshire, England.  William's father was Robert De Mortimer and his mother was Maragert De Say.  His paternal grandfather is Robert De Mortimer; his maternal grandparents were Hugh De Say and Mabel Marmion. He had a brother named Hugh.  He is the younger of the two children.

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