| Male Duke of Brittany Geoffrey |
| Birth | 23 Sep 1158 | |
| Death | 19 Aug 1186 | Paris |
| Burial | ||
| Marriage | Jul 1181 | |
| Father | King of England Henry_II Curtmantle | F504 Group Sheet | |
| Mother | Duchess Eleanor of_Aquitaine | F504 Group Sheet | |
| Female Duchess Constance of_Brittany |
| Birth | ||
| Death | 1201 | |
| Burial | ||
| Other Spouse | Earl of Chester Ranulph | F771 | |
| Marriage | ||
| Other Spouse | Viscount Guy of_Thouars | F772 | |
| Marriage | ||
| Father | Duke Conan of_Brittany | F770 Group Sheet | |
| Mother | ||