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Male Guillaume De Courtenay Click to view Guillaume De Courtenay in the family tree

Guillaume was born in 1170.  Guillaume's father was Pierre Prince Of France and his mother was Isabelle De Courtenay.  His paternal grandparents were Louis VI King of France and Adelaide of Savoy; his maternal grandparents are Renaud Seignuer De Courtenay and Hawaise De Donjon. He had two brothers and six sisters, named Pierre II, Robert, Alix, Unknown Daughter, Eustachia, Clementia, Constance and Isabelle.  He is the second youngest of the nine children. He had a half-brother named Pierre.

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