| Male William de Fiennes |
| Birth | ||
| Death | 1241 | |
| Burial | ||
| Marriage | ||
| Father | Ingelram de Fiennes | F4420 Group Sheet | |
| Mother | Sibyl de Boulogne | F4420 Group Sheet | |
| Female Agnes De Dammartin |
| Birth | ||
| Death | ||
| Burial | ||
| Father | Alberic II Count Of Dammartin | F3887 Group Sheet | |
| Mother | Matilda Of Ponthieu | F3887 Group Sheet | |