Lugaid V was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He was the son of the three findemna, triplet sons of Eochu Feidlech, and their sister Clothru.
Lugaid was conceived of incest. The night before the three findemna (Bres, Nár and Lothar) made war for the High Kingship against their father in the Battle of Druimm Criaich, their sister Clothru, concerned that her brothers could die without heirs, seduced all three of them, and a son, Lugaid, was conceived.
He had ruled for twenty, twenty-five or twenty-six years. The Lebor Gabála synchronises his reign with that of the Roman emperor Claudius (AD 41–54). The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 33–13 BC, that of the Annals of the Four Masters to 33–9 Full-length portrait,
