The Three Battle-Diademed Men of the Island of Britain:

• Drystan ap Tallwch,
• and Hueil ap Caw,
• and Cai ap Cenyr of the Fine Beard.

And one was diademed above the Three of them:
that was Bedwyr ap Bedrawc.

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Bedwyr may be a later interpolation; however, he is often paired with Cai, and the two of them with Gwalchmai ap Gwyar.

Drystan is Tristan, and Hueil is Hoel of Brittany.