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

Guillaume I's father was Guy I de Dampierre and his mother was Helivide de Roucy de Baudemont.  His paternal grandparents were Thibault de Dampierre and Elizabeth De Montlhery; his maternal grandparents were Andre de Roucy de Baudemont and Adele Agnes de Braine. He had two sisters named Agnes and Helvide.


Guillaume I's family with Ermengarde de Mouchy

They had a son named Guy II.

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