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

Willem was born on March 5th, 1364 in Gelderland, Netherlands.1   Willem's father was Duke Wilhelm of Julich VI and his mother was Princess Marie of Guelders.  His paternal grandparents were Duke Wilhelm of Julich V and Johanna of Holland; his maternal grandparents were Duke Reinoud (de Zwarte) of Guelders II and Sophie de Berthout. He had a brother and a sister, named Rainald and Johanna.  He was the oldest of the three children.

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I32787

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