As described in the Ulster Cycle, a warrior of Connacht who comes upon the wounded Conall Cernach after the defeat of Cet. Conall is bleeding so badly that he asks Bélchú to kill him to spare further agony. Instead Bélchú takes him home and heals his wounds. Bélchú's three sons, noticing Conall's might, resolve to murder him before he recovers. Learning of their plan, Conall contrives to have the sons kill their own father instead, after which the heor slays all three, taking their heads with him back to Ulster.