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 Hawise of Normandy. Alan married Bertha, daughter of Odo II, Count of Blois and had at least two children: Conan II, his successor, and Hawise of Brittany, who married Hoel of Cornwall.
Alan III was poisoned, possibly by Duke William of Normandy, who also probably poisoned his son, Conan II.
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Date of birth:
- 997 C.E.
Date of death:
- Oct 1, 1040 (age 43 years)
