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

Guillaume I De was born about 1125 in Troyes,Aube,Champagne,France.  Guillaume I De's father was Guy I de Dampierre and his mother was Helvide De Baudemont.  His paternal grandparents were Thibault de Dampierre and Elizabeth De Montlhery; his maternal grandparents were Andre de Roucy De Baudemont and Agnes De Braine. He had two sisters named Agnes and Helvide De.  He was the oldest of the three children.  He died after 1161 in Dampierre,Aube,Champagne,France.


Guillaume I De's family with Ermengarde Basilie De Mouchy

‌Guillaume I De and Ermengarde Basilie De were married in a religious ceremony in 1160 in ,,France.  They had a son and two daughters, named Guy II De, Elisabeth De and Helvide de.

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