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Male Count of Holland Guillaume d'Avesnes Click to view Count of Holland Guillaume d'Avesnes in the family tree

Guillaume was born in 1307 in Hainaut, Wallonia, Belgium.1   Guillaume's father was Count of Hainault William D'Avesnes III and his mother was Joan Jeanne de Valois.  His paternal grandparents were Count of Flanders, Count of Hainault Jan Avesnes of Holland II and Philippa of Luxemburg; his maternal grandparents were Count of Valois, Anjou & Maine Charles of Valois III and Margaret of Naples. He had two brothers and five sisters, named Jean, Louis, Phillipa, Margaretha, Elizabeth, Johanna and Agnes.  He was the oldest of the eight children.

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=clcaldwell&id=I015691

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