Alan III, Duke of Brittany From Wikipedia, the free encyclopedia. (Redirected from Alan III 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. He was poisoned. | ||||
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