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Son of Smoit. He is on the court list in Culhwch and is probably identical with Selyf from Powys.

The name is possibly referring to a king of Powys, Selyf mab Cynan, who lived in the seventh century. He is found in several genealogies and the Triads as one of the Three Battle Defenders of the Island of Britain.

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Sources
Culhwch and Olwen | Late 11th century
Triads of the Island of Britain (Welsh ”Triads”) | 11th century to 14th century