abbot of Iona. He was of the family of Conall Gulban, and became a monk and abbot at Killochuir (SE. Ulster), and later at Iona. Under his rule, by the persuasion of Egbert, Iona at last adopted the Roman calculation of Easter. For Bede this was the final sign of unity from diversity which was the main theme of his History. Dunchad died on 24 March, his usual feast, but in Donegal it was on 25 May. He was the patron of sailors in Ireland.
Bede, H.E., v. 22;J. Colgan, Acta Sanctorum Hiberniae, i (1645), p. 745;K.S.S., p. 328.