Geoffrey, Duke of Brittany was born 23 September 1158 to Henry II of England (1133-1189) and Eleanor of Aquitaine (1122-1204) and died 19 August 1186 Paris, France of unspecified causes. He married Constance de Bretagne (1161-1201) July 1181 JL .
Geoffrey became Duke of Brittany through marriage. He was possibly killed in a tournament.
Children
| Name | Birth | Death | Joined with |
| Eleanor, Countess of Richmond (1184-1241) | 1184 | 10 August 1241 | |
| Matilda of Brittany (c1185-c1185) | |||
| Arthur I, Duke of Brittany (1187-1203) | 29 March 1187 | 1203 | |
Footnotes (including sources)
| ‡ General |