He was originally a man named Friuch, a pig-keeper, who worked for
Bodb Dearg, king of the Munster
sidh. He fell out with Rucht, who was a pig-keeper for Ochall Ochne, king of the Connaught
sidh. The two fought, transforming into various animal and human forms, ultimately becoming two worms which were swallowed by two cows and reborn as two bulls, Donn Cuailnge and
Finnbhennach ("White-horned"). Donn belonged to
Dáire mac Fiachna, a cattle-lord of
Ulster; Finnbhennach was born into the herds of queen
Medb of
Connacht, but considered belonging to a woman beneath him and joined the herds of her husband,
Ailill. Medb raised an army to steal Donn, and marched on Ulster. As Fergus mac Róich knew the terrain he was chosen to lead. The
Mórrígan, in the form of a crow, warned Donn of the coming army, and Donn Cuailnge goes on a rampage. Cúchulainn met Medb's army on the mount of
Slieve Foy and invoked the right of single combat at a ford, defeating a series of champions in a standoff lasting months. ==Versions==