Guillaume was the son of unknown parents. The date and place of his birth have not been found.
His wife was Denise d'Aigneaux de Ste-Marie-au-Houlme. They were married, but the date and place have not been found. They had no known children.
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | chevalier |