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Male Guillaume D'Avesnes Click to view Guillaume D'Avesnes in the family tree

Guillaume was born in 1254.  Guillaume's father was Jean I D'Avesnes and his mother was Countess of Avesnes Aleida.  His paternal grandparents were Bouchard D'Avesnes and Countess Of Flanders & Hainault Marguerite; his maternal grandparents were V Floris and Mathilde De Brabant. He had five brothers and a sister, named Jean II, Baudouin, Bouchard II, Guy, Floris and Jeanne.  He was the third youngest of the seven children.

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