Alan IV, Duke of Brittany
Alan IV of Cornwall (died 1119) was duke of Brittany, from 1084 to 1112. He was son of Duke Hoel II and Havise of Brittany. Alan IV had to face an invasion of William I of England and was forced to abandon his duchy in 1086. A peace was set in the same year and Alan IV married princess Constance of England, William's daughter. This marriage was forced upon Alan and he is the presumed responsible of Constance's death by poisoning in 1090. He married again in 1093 with Ermengarde of Anjou. By her he had a son Geoffrey, a daughter Havise (married to count Baldwin VII of Flanders) and his heir Conan. Alan IV was not a popular duke and was forced to abdicate in 1112.
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See also: Dukes of Brittany family tree
