Guillaume was the son of Arnaud de Mortagne and Yolande de Coucy. The date and place of his birth have not been found.
He had four marriages/partners. His first wife was Isabelle de Wilde-Espel. They were married, but the date and place have not been found. They had no known children.
His second wife was Pentecôte de Durby. They were married, but the date and place have not been found. They had no known children.
His third wife was Élisabeth de Sloten. They were married, but the date and place have not been found. They had no known children.
His fourth wife was Isabelle d'Oudenaarde. They were married, but the date and place have not been found. They had no known children.
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Arnaud de Mortagne |
Évrard IV Radoul |
Baudouin I van Doornick |
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Hildéarde de Wavrin |
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Enghelbert IV d'Enghien |
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Ide d'Avesnes |
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Thomas de Coucy |
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Mathilde de Rethel |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1294 TO 1391 | seigneur de Dossemer, de Rumes, d'Audenaerde et de Tourcoing |