Conan III, Duke of Brittany

Conan III, also known as Conan of Cornouaille and Conan the Fat (, and ; c. 1093–1096 – 17 September 1148) was duke of Brittany, from 1112 to his death. He was the son of Alan IV, Duke of Brittany and Ermengarde of Anjou.

Conan III allied himself with Stephen of England in the Anarchy, Stephen's war against the dispossessed Empress Matilda.

Family He married Maud, an illegitimate daughter of King Henry I of England before 1113. Conan and Maud had three children that are known: Hoel (1116–1156) – disinherited from the ducal crown; Count of Nantes; Bertha (1114 – after 1155) – married Alan of Penthièvre; upon Alan's death in 1146, she returned to Brittany; Constance (1120–1148) – married Sir Geoffroy II, Sire de Mayenne, son of Juhel II, Seigneur de Mayenne.

Succession On his death-bed in 1148, Conan III disinherited Hoel from succession to the duchy, stating that he was illegitimate and no son of his. By this surprise move Bertha became his heiress and successor. However, Hoel was to retain the County of Nantes.

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