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Male William Mar De Berkeley Click to view William Mar De Berkeley in the family tree

William Mar was born about 1425 in Berkeley, Gloucestershire, England.  William Mar's father was James "The Just" De Berkeley and his mother was Isabel De Mowbray.  His paternal grandparents were James de Berkeley and Elizabeth Bluet; his maternal grandparents were Sir Thomas de Mowbray and Elizabeth Fitz-Alan. He had a brother named Maurice.  He was the younger of the two children. He had a half-sister named Elizabeth.

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