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Male William de la Plaunche , of Wendover Click to view William de la Plaunche , of Wendover in the family tree

William de was born about 1215 in Wendover Manor, Buckinghamshire, England.  William de's father was William I de Fiennes and his mother was Agnes de Dammartin.  His paternal grandparents were Enguerrand de Fiennes , Lord of Martock and Sibyl de Boulogne; his maternal grandparents were Alberic II Comte de Dammartin and Maud (Mathilde) of Clermont. He had a brother and a sister, named Enguerrand de and Mahaut de.  He was the youngest of the three children.

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