 He invented numerous 'Sayings' etc.attributed to Geraint and printed in the notorious third volume of the "Myvyrian Archaiology of Wales".Iolo based his invention on some vague references in medieval English and Scots poetry to a certain Glascurion (the name "Geraint Fardd Glas" and its variants only occurs in Iolo's works) mentioned in Chaucer’s 'House of Fame'