Guillaume was born about 1120, the son of Robert de Pierrepont and Ermengarde de Montaigu. The place is not known.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Hugues (c1145-1188).
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Guillaume de Pierrepont |
Robert de Pierrepont |
Ingobrant |
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Ermengarde de Montaigu |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1120 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Pierrepont |