Conan III, Duke of Brittany

Conan III, also known as Conan of Cornouaille and Conan the Fat (Breton: Konan III a Vreizh, and Konan Kerne; 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.