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

Guillaume Ier was born in 1130.  Guillaume Ier's father was Guy Ier De Dampierre and his mother was Helvide De Baudement.  His paternal grandparents were Thibaut II De Dampierre and Isabeau De Montlhéry; his maternal grandparents were André De Baudement and Agnès De Braine.  He was an only child.  He died before 1162.


Guillaume Ier's family with Irmengarde De Mouchy

‌Guillaume Ier and Irmengarde were married in a religious ceremony in 1154.  They had a son named Guy II Ou III.

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