Íomhaor was the son of Tighearnán who was son of Duarcán, son of Íomhaor, son of Gíolla Chríost, son of Amhlaoibh, son of Tighearnán, the eponym.M.V. Duignan (1934), "The Uí Briúin Bréifni genealogies", pp. 90–137, in JRSAI Vol. 4, No. 1, 30 Jun. 1934.
