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Irereo Fáthach ("the wise"),[1] son of Meilge Molbthach, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor, Óengus Ollom, and ruled for seven or ten years, until he was killed in Ulster by Fer Corb, son of Mug Corb. The Lebor Gabála Érenn synchronises his reign with that of Ptolemy III Euergetes of Egypt (246–222 BC).[2] The chronology of Geoffrey Keating's Foras Feasa ar Éirinn dates his reign to 337–330 BC,[3] the Annals of the Four Masters to 481–474 BC.[4]

Preceded by
Óengus Ollom
High King of Ireland
LGE 3rd century BC
FFE 337–330 BC
AFM 481–474 BC
Succeeded by
Fer Corb


  1. ^ Dictionary of the Irish Language Compact Edition, Royal Irish Academy, 1990, p. 295
  2. ^ R. A. Stewart Macalister (ed. & trans.), Lebor Gabála Érenn: The Book of the Taking of Ireland Part V, Irish Texts Society, 1956, p. 281
  3. ^ Geoffrey Keating, Foras Feasa ar Éirinn 1.30
  4. ^ Annals of the Four Masters M4719-4726