Ailill Caisfiaclach

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Ailill Caisfiaclach ("having crooked/hateful teeth"),[1] son of Connla Cáem, was, according to medieval Irish legends and historical traditions, a High King of Ireland. He succeeded his father, and reigned for twenty-five years, until he was killed by Adamair, the son of the man who had killed Ailill's grandfather. The Lebor Gabála Érenn synchronises his reign with that of Ptolemy V Epiphanes in Egypt (204–181 BC).[2] Geoffrey Keating's Foras Feasa ar Éirinn dates his reign from 315 to 290 BC,[3] the Annals of the Four Masters from 443 to 418 BC.[4]

Preceded by
Connla Cáem
High King of Ireland
LGE 3rd/2nd century BC
FFE 315–290 BC
AFM 443–418 BC
Succeeded by


  1. ^ Dictionary of the Irish Language Compact Edition, Royal Irish Academy, 1990, pp. 98, 102, 303
  2. ^ R. A. Stewart Macalister (ed. & trans.), Lebor Gabála Érenn: The Book of the Taking of Ireland Part V, Irish Texts Society, 1956, p. 283
  3. ^ Geoffrey Keating, Foras Feasa ar Éirinn 1.30
  4. ^ Annals of the Four Masters M4758-4782