Conchobar mac Nessa (son of Ness) was the king of Ulster in the Ulster Cycle of Irish mythology. He ruled from Emain Macha (Navan Fort, near Armagh). He is said to be the son of Fachtna Fáthach, of the Ulaid, although unusually his descent references his mother, Ness, daughter of Eochaid Sálbuide, king of Ulster.