Geraint son of Erbin through a variety of subsequent sources. Later genealogies associate him with southwestern Britain and South Wales in the late 6th century. The early poem "Y Gododdin" mentions a "Geraint before the South", conceivably a reference to Geraint mab Erbin. However, Geraint achieved his greatest fame as the hero of the prose romance "Geraint and Enid", a fictional tale that follows the narrative of Chrétien de Troyes' French work "Erec and Enide". "Geraint son of Erbin" makes heavy use of repetition in celebrating Geraint's deeds at Llongborth, which may be identified with Langport, Somerset, or Portsmouth, Hampshire though "llongborth" may refer
Geraint of Dumnonia the Easter Problem and the shape of the tonsure. It is clear from this letter that in the later 7th century the Britons in Cornwall and Devon still observed Easter on the dates that the British church had calculated, at variance with Roman Catholic practice. Geraint ultimately agreed with Aldhelm to comply with Roman practice on these points. According to John of Worcester, Geraint was killed after a series of battles that culminated in a victory of the West Saxons under Ine of Wessex in 710. It was probably around this time that Devon was conquered by the West Saxons.