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Male Jean I D'Avesnes Click to view Jean I D'Avesnes in the family tree

Jean I was born about 1241.  Jean I's father was Baudouin D'Avesnes and his mother was Félicité De Coucy.  His paternal grandparents were Bouchard D'Avesnes and Countess Of Flanders & Hainault Marguerite; his maternal grandparents were Thomas II de Coucy and Mathilde De Rethel. He had a sister named Beatrice.  He was the older of the two children.

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