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Male William De Avesnes Click to view William De Avesnes in the family tree

William was born about 1254 in Valenciennes, Nord, France.  William's father was Jean I D'Avesnes and his mother was Adelheid Von Holland.  His paternal grandparents were Bouchard d'Avesnes and Margarethe Von Flandern; his maternal grandparents were Florens IV Von Holland and Mathilde Von Brabant. He had five brothers and a sister, named Johann I, Baldwin, Bouchard, Guy, Floris and Jeanne.  He was the third youngest of the seven children.

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