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.
Iolo associates Geraint, an obscure figure in Welsh literature, with the invention of cynghanedd and the brotherhood of King Morgan of Morgannwg. He even endeavored to link Geraint to Asser within the context of Alfred the Great's court.