Guillaume was the son of unknown parents. The date and place of his birth have not been found.
He died before 1340. The place is not known.
His wife was Jeanne de Caumont. They were married, but the date and place have not been found. Their only known child was Jean I (c1290-1358).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Death | BEF 1340 |
|
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Rély et de Caumont |