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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>.1   Willem IV's father was Willem III d'Avesnes and his mother was Jeanne De Valois.  His paternal grandparents were Jean II d'Avesnes and Philippa Luxembourg; his maternal grandparents were Charles I Capet and Marguerite di Sicily-Naples. He had two brothers and six sisters, named Jan, Louis, Johanna, Sibylla, Margaretha, Isabella, Agnès and Philippa.  He died on September 26th, 1345 in , Worms, Rhineland-Palatinate, Preussen.  He was buried in , Valenciennes, Nord, France.1 1 

1 Isabella D'AVESNES.FTW
Further sources/citations:
"Héraldique européenne", "Genealogical Research of Kirk Larson"

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