Guillaume was born about 1085, the son of unknown parents. The place is not known.
He died about 1140. The place is not known.
His wife was Mabille FitzRoy, who he married in 1122. The place has not been found. Their only known child was Guillaume IV (c1125-1171).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1085 |
|
|||
| Death | ABT 1140 |
|
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Montmirail, d'Alluyes et de Château-du-Loir | |||||
| Nobility Title | comte du Perche |
Note 1
Note 2
continued in Richards tree