Guillaume was the son of Hugues de Pierrepont and Agathe dite Clémence de Vitry. The date and place of his birth have not been found.
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Hugues de Pierrepont |
Guillaume de Pierrepont |
Robert de Pierrepont |
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Ermengarde de Montaigu |
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Agathe dite Clémence de Vitry |
Ithier de Rethel |
Eudes de Vitry |
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Mathilde |
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Béatrix de Namur |
Godefroy I de Namur |
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Ermesinde de Luxembourg |
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