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On 1 August 939, with the aid of Judicael (Berengar), count of Rennes, and Hugh I, count of Maine, his victory was made complete by defeating the Norse at Trans.
Alan II, Earl of Menteith married an unknown lady, by whom he had a daughter Mary II, Countess of Menteith.
While they were eventually expelled by Alan's grandson, Alan II, Duke of Brittany, the subsequent rulers of Brittany were weaker than Alan the Great.
Bertha of Blois, the daughter of Odo II of Blois, became Duchess Consort of Brittany through her marriage to Alan II, Duke of Brittany.
Sometime after 1355, his son Sir John married Mary II, suo jure Countess of Menteith, the daughter of Alan II, Earl of Menteith.
Subsequent to the invasion of the Loire Viking fleet led by Rognvaldr in 919, he exiled himself and his son Alan, to England.