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Male William de Clare Click to view William de Clare in the family tree

William was born on May 18th, 1228.  William's father was Gilbert de Clare Earl of Gloucester & Hertford and his mother was Isabella Marshal.  His paternal grandparents were Sir Richard FitzRoger de Earl of Hertford and Amicia FitzRobert Cts de Gloucester; his maternal grandparents were Sir William Marshal Earl of Pembroke and Isabel de Clare Cts de Strigoil. He had two brothers and three sisters, named Richard de Clare, Gilbert, Amicia, Isabel and Agnes. He had four half-brothers and a half-sister, named Henry, Richard, Nicholas, John and Isabella.  He died at the age of 30 in July 1258.

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