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Male Sir William de St. Maur II of Undy and Penhow Click to view Sir William de St. Maur II of Undy and Penhow in the family tree

Sir William was born in of Penhow, Monmouthshire.  Sir William's father was Sir William de St. Maur and his mother was Eva Marshal.  His maternal grandparents were Sir William Marshal Earl of Pembroke and Isabel de Clare Cts de Strigoil. He had a brother named Sir Roger. He had a half-brother and six half-sisters, named Peter, Eva, Isabela, Maud, Eleanor, Ela and Joan.  He died in 1271.

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