‘Slender Awl’
Kulvanawyd

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An Arthurian warrior who was the son of Gwryon.

In the Triad he might be the same character as Kulvanawyt of Britain, father of four daughters, where Essyllt (Isolde) and Gwenhwyvar (Guenevere) would be two of them.

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Source
Culhwch and Olwen | Late 11th century