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Ailill Caisfiaclach ("having crooked/hateful teeth"), 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 Fer Corb 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). Geoffrey Keating's "Foras Feasa ar Éirinn" dates his reign from 315 to 290 BC, the "Annals of the Four Masters" from 443 to 418 BC.