Geoffrey IV Plantagenet Duke of Brittany, Earl of Richmond 1688
- Born: 23 Sep 1158 1688
- Marriage (1): Constance Duchess of Brittany, Countess of Richmond in Jul 1181 1688
- Died: 19 Aug 1186, Paris, Rhône-Alpes, France at age 27 1688
- Buried: Notre Dame, Paris, France 1688
 General Notes:
Duke of Brittany and earl of Richmond, the fourth, but third surviving, son of Henry II of England and Eleanor of Aquitaine.
In 1166, in furtherance of his father's policy of extending and consolidating Angevin power in France, Geoffrey was betrothed to Constance, daughter and heir of Conan IV, Duke of Brittany. At the same time, Duke Conan was forced to surrender to Henry II for Geoffrey's use the whole duchy of Brittany except the county of Guingamp. Geoffrey received the homage of the Breton nobles in 1169, and in 1173 he joined the rebellion against Henry II led by his eldest brother, Henry, the "Young King," and supported by the rulers of France, Scotland, and Flanders. He submitted to his father at Michaelmas, 1174, and was sent back to Brittany, where he proceeded to recover lost ducal estates and subdue rebellious barons. He and Constance were married in 1181.
From then until his death he fought against both his brother Richard the Lion-Heart and his father (toward whom he behaved atrociously), largely for possession of Anjou. In 1185 he issued an "assize" at Rennes regularizing the succession to military fiefs in Brittany. He died at Paris while forming an alliance with Philip II of France against Henry II, either of illness or in a tournament, leaving a daughter, Eleanor, and a posthumous son, Arthur I. 1688
Life Events:
1. Acceded: Duke of Brittany, 1171. 1688
Geoffrey married Constance Duchess of Brittany, Countess of Richmond, daughter of Conan IV "la Petit" Duke of Brittany and Margaret of Huntingdon Countess of Hereford, Duchess of Brittany, in Jul 1181.1688 (Constance Duchess of Brittany, Countess of Richmond was born about 1161 1688 and died on 5 Sep 1201 in Nantes, Brittany 1688.). The cause of her death was Died in Childbirth or of Smallpox.
Marriage Notes:
In 1166, in furtherance of his father's policy of extending and consolidating Angevin power in France, Geoffrey was betrothed to Constance, daughter and heir of Conan IV, Duke of Brittany. 1688
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