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King of Ireland in Culhwch and Olwen. He was the son of Aedd and the brother of Gwitart.

As one of his forty tasks, Culhwch needed Odgar to draw the tusk out of the chief boar Ysgithyrwyn. Culhwch also needed to obtain a magic cauldron from Diwrnach, Odgar’s steward. When Diwrnach refused to hand it over, Arthur and his men destroyed Ireland.

Source
Culhwch and Olwen | Late 11th century