British - An Irishman. An overseer of Odgar. He was the owner of a famous cauldron that Ysbaddaden required Culhwch to get as part of his quest for the hand of Olwen. When he refused to hand it over, King Arthur sent a force to seize it and Diwrnach was killed in the fight. This cauldron became one of the Thirteen Treasures of Britain collected by Merlin. In some references, known as Diwrnach, Dyrnwch or Dyrnwch.

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