Alain III of Brittany
| Alan III | |
|---|---|
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|
| Duke of Brittany | |
| Reign | 20 November 1008 – 1 October 1040 |
| Predecessor | Geoffrey I |
| Successor | Conan II |
| Regent | Hawise of Normandy (Regent 1008 - 1026) |
| Born | c. 997 |
| Died | 1 October 1040 Vimoutiers |
| Spouse | Bertha of Blois |
| Issue |
Conan II Hawise |
| House | Rennes |
| Father | Geoffrey I |
| Mother | Hawise of Normandy |
| Religion | Roman Catholicism |
Alan III of Rennes (997–1 October 1040) (French: Alain III de Bretagne) was Count of Rennes and duke of Brittany, by right of succession from 1008 to his death.
He was the son of Duke Geoffrey I and Hawise of Normandy. Alan succeeded his father as Duke of Brittany in 1008. Because he was still a minor at his father's death, his mother acted as regent of Brittany while her brother Richard II, Duke of Normandy assumed guardianship over Brittany. In 1018 Alan married Bertha of Blois, daughter of Odo II, Count of Blois and his second wife Ermengarde of Auvergne.
When Richard III, Duke of Normandy died in August 1026, his brother Robert I succeeded him. Alan apparently took advantage of the resulting turmoil to break free of Norman suzerainty. In the early 1030s Robert I successfully attacked Dol and Alan's retaliatory raid on Avranches was repulsed causing continued raiding back and forth between them. Facing an invasion from Normandy via land and from Duke Robert's fleet, Robert, Archbishop of Rouen mediated a truce between his two nephews at Mont Saint-Michel where Alan swore fealty to his cousin Robert. When he left Normandy for the Holy Land Robert I, Duke of Normandy appointed his cousin, Alan III, to be a guardian of his young son William. Alan III also assisted Herbert I 'Wake-Dog' in his wars with Avesgaud, Bishop of Le Mans and was with the count in his attack on Avesgaud's castle at La Ferté-Bernard destroying the castle and causing Avesgaud to flee.
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