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Male Guillaume Decourtenay Click to view Guillaume Decourtenay in the family tree

Guillaume was born about 1098 in Courtenay, Loiret, France.  Guillaume's father was Milo De Courtenay and his mother was Ermengarde De Nevers.  His paternal grandfather was Josceline De Courtenay and his paternal grandmother is Isabel De Montlhery; his maternal grandfather was Renaud Nevers and his maternal grandmother is Ida De Forez. He had two brothers named Josceline and Renaud (Reginald).  He was the second oldest of the three children.  He died in 1147.

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