Guillaume Ier De Dampierre & 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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Children
Guy II Ou III De Dampierre
Guy II Ou III was born in 1155. He died at the age of 61 on January 18th, 1216. He was buried in , Blois, 41,.
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