[cf. Ir. necht, washed, clean, pure; taken from a folk etymology, possibly related to Nechtan].
Ancestor-deity of the Leinstermen, and probably identical with the divine king known in the Mythological Cycle as Nuadu Airgetlám. He succeeds Eterscél, father of Conaire Mór, as king of Tara. In the Fenian Cycle Nuadu Necht is the original possessor of the Hill of Allen [Almu], which is also attributed to his ‘son’ Tadg mac Nuadat; Tadg may be an alias for Nuadu himself. Nuadu is also a reputed ancestor of Fionn mac Cumhaill on the maternal side; son Tadg mac Nuadat is the father of Muirenn, mother of Fionn, which means that Nuadu may be either the grandfather or great-grandfather of the hero. Nuadu Necht may contribute to the characterization of Nechtan (1).