Exiled former king of Ulaid and brother of Sualtam; foster-father of Cú Chulainn and, in exile, leader in Medb and Ailill's host against Ulster and the lover of Medb. His outrage at Conchobar's betrayal of the Sons of Uisliu drove his defection to Connacht, and his withdrawal from single combat with Cú Chulainn in the Táin (honoring an earlier pact) is a pivotal episode. Wielder of Caladbolg. Mortal-tier.