Saint Ailill the First (also called Ailill the Elder, Ailill I, Ailiell, Ailild, Ailid, Alild, Ailillus, Alellus, Alildus, Oilill, Oileal, Oileald, Olildus, Olild, Elias, Eulalius, Helias) born c. 460 – died 13 January 526, was the Bishop of Armagh, Ireland from 513 to 13 January 526.