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Male Willem I of Guelders Click to view Willem I of Guelders in the family tree

Willem I of was born in Gelderlands, Netherlands.  Willem I of's father was Wilhelm VI of Julich and his mother was Marie of Guelders.  His paternal grandparents were Wilhelm V Von Julich and Johanna Von Hennegau; his maternal grandparents were Reinoud II "the Black" Van Guelders and Sophie De Berthout. He had a brother and a sister, named Rainald IV of and Johanna.

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