Ailill II

Holy Hierarch Ailill II (also called Ailill the Younger) was bishop of Armagh in Ireland from 526 to 536, the eighth in the succession of Saint Patrick. He belonged to the Úi Bressail, a clan from the south side of Lough Neagh, and was born at Drum Cád in County Armagh.

He was appointed bishop on the death of his kinsman Saint Ailill I, on 13 January 526, and shepherded the Church for ten years. The Irish annals record his death between the years 534 and 536, and tradition places it on 1 July 536. After his death he was venerated as a saint, and his memory is kept on the day of his repose, 1 July. His name appears in the Irish martyrologies (Tallaght, Gorman, Donegal) and in the Acta Sanctorum of the Bollandists. He is honored as a saint of the undivided Church.