Geoffrey Keating, who interprets his epithet as meaning "great hogs", dates his reign to 1050–1032 BC, the Annals of the Four Masters to 1428–1410 BC.
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He came to power by killing the incumbent High King, Eochu Mumu, who had killed his father twenty-one years earlier.
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Óengus Olmucaid (or Aengus Olmucada), son of Fíachu Labrainne, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
Óengus II | Óengus mac Nad Froích | Óengus mac Fergusa | Óengus I |
Rothechtaid mac Main, son of Maen, son of Óengus Olmucaid, according to medieval Irish legend and historical tradition, High King of Ireland