‘Sawyl High Head’

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One of Arthur’s warriors in Welsh legend of Culhwch.

In The Life of St. Cadoc he is a tyrant who mistreated a saint, and thus engulfed by the earth.

He is also found in the Triads where he is listed as one of the Three Arrogant Men of the Island of Britain.

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Sources
Culhwch and Olwen | Late 11th century
Life of St. Cadoc | Lifris, late 11th century
Triads of the Island of Britain (Welsh ”Triads”) | 11th century to 14th century