Guillaume was the son of unknown parents. The date and place of his birth have not been found.
His wife was Aliénor de Sully, who he married on 15 MAR 1325. The place has not been found. They had no known children.
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | vicomte de Mareville |