‘King of Kingsmen’
Cerenhyr

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Son of Gereinyawn and father of Arthur’s warrior Berwyn.

A Welsh Triad lists him as one of the three

who could not be expelled from Arthur’s court.

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