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Male Willem IV De Hainault Click to view Willem IV De Hainault in the family tree

Willem IV was born about 1317.  Willem IV's father was Willem III De Avesnes and his mother was Jeanne De Valois.  His paternal grandparents were Jean II De Avesnes and Philippine De Luxembourg; his maternal grandparents were Charles I Capet De Valois and Marguerite De Naples. He had two brothers and seven sisters, named Jan, Louis, Sibylla, Margaretha, Phillipa, Johanna, Agnaes, Catherine and Elisabeth.  He is the fifth youngest of the ten children.

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