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Male Guillaume Ier De Poitou Click to view Guillaume Ier De Poitou in the family tree

Guillaume Ier was born on July 22nd, 1136 in , Argentan, 61,.  Guillaume Ier's father was Geoffreyv Thefair Plantagenet Count and his mother was Matilda Princessof England D'angleterre.  His paternal grandparents were Foulquesv (Fulk) D'anjou Count and Ermengard; his maternal grandparents were Henry I Beaucleric King Of England and Matilda (Edith) "Atheling" D'ecosse Princess Of. He had three brothers named henry_ii, vi and William.  He was the youngest of the four children. He had a half-sister named Emma.  He died at the age of 27 on January 30th, 1164 in , Rouen, 76,.


Guillaume Ier's family with Constance De Bretagne

‌Guillaume Ier and Constance were married in a religious ceremony about 1155.  They had a son named Geoffroy Ier.

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