Constance (Breton: Konstanza; c. 1161 – c. 5 September 1201) was Duchess of Brittany from 1166 to her death in 1201 and Countess of Richmond from 1171 to 1201. Constance was the daughter of Duke Conan IV by his wife, Margaret of Huntingdon, a sister of the Scottish kings Malcolm IV and William I. Her first husband was Geoffrey, fourth son of King Henry II of England.
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Constance of Brittany in the context of Arthur I, Duke of Brittany
Arthur I (Breton: Arzhur; 29 March 1187 – presumably 1203) was 4th Earl of Richmond and Duke of Brittany between 1196 and 1203. He was the son of Duchess Constance of Brittany, born posthumously to Constance's first husband, Duke Geoffrey II. Through Geoffrey, Arthur was the grandson of King Henry II of England and Duchess Eleanor of Aquitaine, and the nephew of King Richard I of England.
In 1190, Arthur, whose father had died, was arguably designated heir to the throne of England and its French territory, but as he was dying in 1199, Richard I named his youngest brother John heir to the throne, as Arthur was still just a child. Philip II of France thought to make use of a potential succession crisis in England and Brittany and for a while Arthur joined him.