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Male William I de Fiennes Click to view William I de Fiennes in the family tree

William I de was born in 1168 in Wendover Manor, Buckinghamshire, England.  William I de's father was Enguerrand de Fiennes , Lord of Martock and his mother was Sibyl de Boulogne.  His paternal grandparents were Eustace II Baron de Fiennes , Sir and Margaret de Guines; his maternal grandparents were Faramus de Boulogne and Matilda.  He was an only child.  He died at the age of 73 in 1241 in Holy Lands.


William I de's family with Agnes de Dammartin

‌William I de and Agnes de were married in a religious ceremony about 1203 in Martock, Somerset, England.  They had two sons and a daughter, named Enguerrand de, William de and Mahaut de.

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