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Male Guillaume III le Bon Ct de Hainault & Holland Click to view Guillaume III le Bon Ct de Hainault & Holland in the family tree

Guillaume III le Bon was born in 1280 in Hainault, France.  Guillaume III le Bon's father was Jan II de Hainault Ct de Holland and his mother was Countess Philippa de Luxemburg.  His paternal grandparents were Jean de Avesnes Ct de Flanders and Aleidis Cts de Hainault; his maternal grandparents were Henri V the Blind of Duc de Luxemburg and Marguerite de Bar Mousson Cts de Bar-le-Duc. He had a sister named Margarete.  He died at the age of 57 on June 7th, 1337 in Valenciennes, Nord, France.

Guillaume III le Bon's family with Jeanne de Valois

‌Guillaume III le Bon and Jeanne were married in a religious ceremony on May 29th, 1305 in Chanay, Ain, France.  They had a son and three daughters, named Guillaume IV, Margaretha, Phillipa and Joan.

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