Alan III, Duke of Brittany

Alan III of Rennes (997 – October 1, 1040) was duke of Brittany, from 1008 to his death. He was son of Duke Geoffrey I and Havise of Normandy. Alan married Bertha of Blois and had at least two children: Conan II his successor, and Havise of Brittany, who married Hoel of Cornwall.

Emma of Brittany who was wife of Robert de Bruges and mother Robert de Brusse is also considered a daughter of Alan III. Her son is the ancestor of the House of Bruce.

Alan III was poisoned.

Preceded by: Geoffrey I

Duke of Brittany

Succeeded by: Conan II