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Guillaume I of Dampierre (c. 1130 - c. 1174) was Lord of Dampierre, Saint-Dizier, Moëslains and Saint-Just, Constable of Champagne and Viscount of Troyes in the middle of the 12th century. He was the son of Guy I of Dampierre, lord of Dampierre, and Helvide de Baudément.
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