Guillaume I de Fiennes, Seigneur de Fiennes

(died 1241) (d. 1241)

Parents

• Enguerrand I de Fiennes, Lord of Fiennes
• Sibylle de Tingry, Dame de Tingry

Children

• unknown daughter de Fiennes
• Mahaut de Fiennes, Dame de Heuchin

Siblings

• Thomas de Fiennes

Partners

• Agnès de Dammartin