The earliest of the Irish calendars, the Martyrology of Tallaght, records the commemoration of Saint Abban on August 24. There are at least two other saints of this name, one with a feastday on March 16 is said to be the nephew of the pre-Patrician saint, Ibar. Whether the entry in the Martyrology of Tallaght is a secondary feast of this Abban or refers to an entirely different individual is unknown. Canon O'Hanlon is unable to make much in the way of comment:
A festival in honor of Abban, is met with in the published Martyrology of Tallagh, at the 24th of August. The same entry is to be found in the Book of Leinster copy.
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