Summary

Anonymous Welsh Triads — from the Red Book of Hergest

Caswallawn son of Beli until the time of Custennin the Blessed, Arthur's grandfather. This is the answer that Arthur gave to the emperor's messengers: that the men of Rome had no greater claim to tribute from the men of this Island, than the men of the Island of Britain had from them. For Bran son of Dyfnwal and Custennin son of Elen had been emperors in Rome, and they were two men of this Island. And they Arthur mustered the most select warriors of his kingdom (and led them) across the sea against the emperor.
Source: Wikisource

Anonymous Welsh Triads — from the Red Book of Hergest

And in the end Arthur encountered the emperor, and Arthur slew him. And Arthur's best men were slain there. When Medrawd heard that Arthur's host was dispersed, he turned against Arthur, and the Saxons and the Picts and the Scots united with him to hold this Island against Arthur. And when Arthur heard that, he turned back with all that had survived of his army, and succeeded by violence in landing on this Island in opposition to Medrawd.
Source: Wikisource

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