Dagr often came to Mary's tavern to take a share of the profits, threatening her with violence. On one such day, he was unhappy with how little he received, and upon holding a knife to her throat was challenged by a young stranger (who, unknown to him, was Prince Arthur). Upon being mocked by Merlin, Dagr called his men into the tavern, and a full fledge fist fight ensued in the tavern. Arthur and his allies won, and Dagr was put in the stocks, desperate for revenge.