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Male Count of Hainault William D'Avesnes III (Willem de Avesnes, Guillaume III D'Avesnes) Click to view Count of Hainault William D'Avesnes III in the family tree

William was born in 1286 in Avesnes, Pas-de-Calais, France.1   William's father was Count of Flanders, Count of Hainault Jan Avesnes of Holland II and his mother was Philippa of Luxemburg.  His paternal grandparents were Count of Hainault Jean de Avesnes of Flanders I and Countess Aleidis of Hainault; his maternal grandparents were Henry (The Great, The Blonde) of Luxemburg III and Mathilde Marguerite de Bar. He had a sister named Yolande. He had a half-brother named William.  He died at the age of 51 on June 7th, 1337 in Valenciennes, Nord, France.1 

Family Details of William's family with Joan Jeanne de Valois

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