William (Guillaume)
| Father | Etienne Count of Blois and Chartres |
| Mother | Adela |
| Birth* | William (Guillaume) was born before 1084. |
| He was the son of Etienne Count of Blois and Chartres and Adela. | |
| Marriage* | William (Guillaume) married Agnes, daughter of Gilon , Lord of_Sully and Eldeburge. |