Dublittir (d. 796), abbot of Finglas, Co. Dublin, was one of the leaders of the Céli Dé reform movement in the eighth-century Irish church. The sources for his life and his monastic rule are three documents known as ‘The rule of the Céli Dé’, ‘The customs of Tallaght’, and ‘The monastery of Tallaght’, in which he appears as the counterpart of the other reform leader, Máel-ruain (qv) of Tallaght, whose rule was rather more strict.
One of the stories related of the two reformers concerns an argument between them on the dispensing of beer to their monks on the three great church festivals of Christmas, Easter, and Pentecost. Máel-ruain apparently refused to permit it as it caused forgetfulness of God; Dublittir, however, allowed it, on the grounds that his monks would get to heaven just as well as those of Máel-ruain.
The only historical event certainly connected with Dublittir is his presidency over a congress of the elders of the Uí Néill and Leinstermen which was held at Tara in 780, probably for the purpose of establishing peace between the parties. According to the Annals of Ulster, many anchorites and scribes were present, ‘of whom Dublittir was leader’. His death is given at 15 May in the annals.