Guillaume was the son of unknown parents. The date and place of his birth have not been found.
He died in 1206. The place is not known.
His wife was Agnès de Noyers. They were married, but the date and place have not been found. They had no known children.
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Death | 1206 |
|
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | vicomte de Saint-Florentin |
Note 1
son of Rahier de Montigny, Seigneur de Florentin and Ada de Montmirail