The Annals of Ulster, sub anno 1186, record that "Conchubhar Ua Flaithbertaigh was killed by Ruaidhri Ua Flaithbertaigh, by his own brother, in Ara."

• Ó Flaithbertaigh

• Annals of Ulster, ed. and tr. W. M. Hennessy and B. Mac Carthy (2008) [1895]. Annala Uladh: Annals of Ulster otherwise Annala Senait, Annals of Senat: a Chronicle of Irish Affairs from A.D. 431 to A.D. 1540 (Revised ed.). Dublin: Longman – via CELT. (4 vols)
• West or H-Iar Connaught Ruaidhrí Ó Flaithbheartaigh, 1684 (published 1846, ed. James Hardiman).
• Byrne, F.J. (2001) [1973]. Irish Kings and High-Kings (2nd ed.). Dublin: Four Courts Press. ISBN 978-1-85182-196-9.
• Origin of the Surname O'Flaherty, Anthony Matthews, Dublin, 1968, p. 40.