Lugaid Íardonn, son of Énna Derg, was, according to medieval Irish legend and historical tradition, a High King of Ireland. His epithet, Old Irish for "dark brown",Dictionary of the Irish Language, Compact Edition, Royal Irish Academy, 1990, pp. 243, 375 came from the colour of his hair.Geoffrey Keating, Foras Feasa ar Éirinn 1.27 He succeeded his father, who had died of plague, to the throne, and ruled for nine years before he was killed at Ráth Clochair by Sírlám, son of Finn mac Blatha. The Lebor Gabála Érenn synchronises his reign with that of Artaxerxes I of Persia (465–424 BC).R. A. Stewart Macalister (ed. & trans.), Lebor Gabála Érenn: The Book of the Taking of Ireland Part V, Irish Texts Society, 1956, p. 255 The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 658–649 BC, that of the Annals of the Four Masters to 881–872 BC.Annals of the Four Masters M4320-4328
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