On June 19th the earliest of the Irish calendars, the late eighth/early ninth-century Martryrology of Tallaght, records the name of Coelain, of Doire Choelaine. Canon O'Hanlon speculates that this locality could be the modern Derrycullion in the lakeland county of Fermanagh:
St. Coelain or Caolan, of Doire Choelaine.
On the 19th of June, we read in the Martyrology of Tallagh, that Coelain, of Doire Choelaine, was venerated. Derrycullion is the only Irish townland we find, nearly resembling the foregoing ancient denomination. It is situated in the parish of Aghalurcher, barony of Magherastephana, and county of Fermanagh. The Martyrology of Donegal, at this same date, merely records Caolán, of Doire. In the table, subjoined to this Martyrology, his name has been rendered into the Latinized form, Caelianus.
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