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 is the "young Welshman" who was killed there. However, other locations have also been suggested. Hypotheses about the location of the battle range from Somerset, bordering Dumnonia, to as far north as Kingdom of Strathclyde. The early poem "Y Gododdin" mentions a "Geraint before the South", conceivably a reference to Geraint mab Erbin. His deeds at the Battle of Llongborth are celebrated in the poem "Geraint son of Erbin", written probably in the 10th or 11th century, and traditionally attributed to Llywarch Hen. However, Derek Bryce, following other scholars, suggests that the later, historical Geraint of Dumnonia (d. 710) may