Constance
| Father | William I The Conqueror, King of England |
| Mother | Matilda of Flanders |
| Birth* | Constance was born in 1061. |
| She was the daughter of William I The Conqueror, King of England and Matilda of Flanders. | |
| Marriage* | Constance married Alain Duke of Brittany in 1086. |