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

Guillaume was born about 1215.  Guillaume's father was Robert III De Poissy and his mother was Lucie De Neufbourg.  His paternal grandparents were Robert II De Poissy and Luce Le Chambellan; his maternal grandparents were Robert De Neufbourg and Isabeau Crespin.  He was an only child.  He died about 1270.


Guillaume's family with Isabelle De Lévis

‌Guillaume and Isabelle were married in a religious ceremony about 1240.  They had a daughter named Mahaut.

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