Rothechtaid, son of Maen, son of Óengus Olmucaid, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He came to power by killing the previous incumbent, his grandfather's killer Énna Airgdech, in the battle of Raigne. He ruled for twenty-two years. The Lebor Gabála Érenn gives two versions of his death. In one version, he was killed in single combat in Cruachan by Sétna Airt, who fought to protect his son Fíachu Fínscothach. In the other version, he died of his wounds in Tara. The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 1005–980 BC, that of the Annals of the Four Masters to 1383–1358 BC.