 Iolo called him Geraint Fardd Glas or Y Bardd Glas o'r Gadair ("the Blue Bard of the (Bardic) Chair") and associated him with his version of the early history of Morgannwg (Glamorgan).Iolo makes the figure of Geraint, otherwise unattested in Welsh manuscript sources or tradition, the inventor of cynghanedd and brother of king Morgan of Morgannwg.He even went so far as to equate him with Asser in the court of Alfred the Great.