‘Heavy Battled-Hand of the Border of Eidyn’
Llongad Grwyrm Fargod Eidyn

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The warrior who killed Afaon (Adaon ab Taliesin), son of Taliesin, according to a Welsh Triad entitled Three Unfortunate Assassinations of the Island of Britain.

Another Triad notes that Afaon avenged his death from the grave, so Llawgad may have been killed.

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Source
Triads of the Island of Britain (Welsh ”Triads”) | 11th century to 14th century