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Male Guillaume De Dampierre Click to view Guillaume De Dampierre in the family tree

Guillaume was born about 1224 in Dampierre, Jura, France.  Guillaume's father was Guillaume II De Dampierre and his mother was Countess Of Flanders & Hainault Marguerite.  His paternal grandparents were Gui II De Dampierre and Mahaut De Bourbon; his maternal grandparents were Baldwin XI and Marie De Champagne. He had two brothers and two sisters, named Guy, Jean, Jeanne and Marie.  He was the oldest of the five children. He had two half-brothers and two half-sisters, named Jean I, Baudouin, Isabell and Isabelle.

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