¶1] Mag Corainn, whence the name? Not hard to say. Corann, harper to Dian Cecht the Dagda's son, called with his harp Caelcheis, one of Drebriu's swine. And Caelcheis ran northward as fast as his legs would carry him; and the hounds of Connaught and their soldiery pursued him as far as Ceis Chorainn. Hence come the names of Ceis Chorainn and Mag Corainn.