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Male Willem IV D'Avesnes Click to view Willem IV D'Avesnes in the family tree

Willem IV was born about 1317 in Le Quesnoy, Nord, France.  Willem IV's father was Wilhelm III Von Holland and his mother was Jeanne De Valois.  His paternal grandparents were Johann I von Hennegau and Philippa of Luxembourg; his maternal grandparents were Charles I of France and Marguerite di Sicily-Naples. He had a brother and six sisters, and also a sibling of unknown gender, named Louis, Sibylla, Margaretha, Isabella, Agnes, Johanna, Philippa and Jan.

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