Eochu (or Eochaid) Uairches, son of Lugaid ÃÂardonn, was, according to medieval Irish legend and historical tradition, a High King of Ireland. After Lugaid was overthrown and killed by SÃÂrlám, Eochu was driven into exile overseas, but he returned after twelve years, killed SÃÂrlám with an arrow, and took the throne. His epithet is obscure: the Lebor Gabála ÃÂrenn says he gained it because of his exile, while Geoffrey Keating explains it as meaning "bare canoes", because he had canoes for a fleet, in which he and his followers used to plunder neighbouring countries. He ruled for twelve years, before he was killed by Eochu FÃÂadmuine and Conaing Bececlach. The Lebor Gabála synchronises his reign with that of Artaxerxes I of Persia (465âÂÂ424 BC). The chronology of Keating's Foras Feasa ar ÃÂirinn dates his reign to 633âÂÂ621 BC, that of the Annals of the Four Masters to 856âÂÂ844 BC.