The son of Gwynn Hên and one of the seven Britons to survive the battles between Bendigeid Vran and Matholwch and return to Britain, carrying the head of Bendigeid Vran, which had been cut off at the King’s own request to be buried at the White Mount in London, the face towards France, forever acting as a guardian over the country.
The others that returned with him were Pryderi, Manawydan, Taliesin, Ynawc (Ynawag), Grudyen (Gruddieu) and Gluneu Eil Taran (Glifieu), along with Branwen, the unfortunate maiden who was the cause of the battles.