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Male William De St. Pierre Click to view William De St. Pierre in the family tree

William De was born about 1103 in Monmouthshire, Wales.  William De's father was Ranulph Le Meschin and his mother was Lucia of Mercia.  His paternal grandparents were Ranulph le Meschin and Maud d'Avranches; his maternal grandparents were Turold of Lincoln and Alvarissa Malet. He had two brothers and a sister, named Ranulph, Ranulph and Alice. He had a half-brother and two half-sisters, named Earl of, Christina and Beatrice.

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