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Male Guillaume von Avesnes Click to view Guillaume von Avesnes in the family tree

Guillaume was born in 1254 in Of, Valenciennes, Nord, France.1   Guillaume's father was Jean I von Avesnes and his mother was Aleida Countess von Holland.  His paternal grandparents were Bouchard von Avesnes and Marguerite Countess von Flandern und Hainault; his maternal grandparents were Floris IV Count von Holland and Mathilde Prinz von Brabant. He had five brothers and two sisters, named Jean II, Baudouin, Bouchard, Guy, Floris, Marguerite and Jeanne.  He was the third youngest of the eight children.  He died at the age of 42 in 1296.1 

1 World Family Tree Vol. 11, Ed. 1 @ Tree #3804

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