Eufydd fab Dôn

Eufydd fab Dôn is a minor figure in Welsh mythology, the son of the mother goddess Dôn and brother to the better-known figures of Gwydion, Amaethon, Gofannon and Arianrhod. He is generally believed to have derived from the Gaulish god Ogmios and is cognate to the Irish hero Oghma Grianainech.