October 26 – Ferghal mac Diarmata becomes Lord of Moylurg after his brother, Conchobhar Mac Diarmada, dies.
Muircheartach Ó Briain, King of Thomond, dies. He is succeeded by his brother, Diarmaid, who is expelled by Brian Bán MacDomnaill Ó Briain.
Toirdhealbhach Ó Conchobhair recovers kingship of Connacht from Aodh mac Aodh Breifneach. He makes peace with Mac Diarmada.
King Niall Ó Domhnaill of Tir Conaill is deposed by his nephew Aonghus, with the aid and support of O Baoighill, Ó Dochartaigh, the MacSweenys and Aodh Reamhar Ó Neill.
Clann Mhuircheartaigh is expelled from Bréifne by Ualgarg Mór Ó Ruairc, O Conchobhair, and Tadgh Mág Ragnaill. He is given refuge by King Aonghus of Tír Conaill in Tír Aodha (Tirhugh, County Donegal).
"The Annals of Ireland by Friar John Clyn", edited and translated with an Introduction, by Bernadette Williams, Four Courts Press, 2007. ISBN978-1-84682-034-2, pp. 240–244.
"A New History of Ireland VIII: A Chronology of Irish History to 1976", edited by T. W. Moody, F.X. Martin and F.J. Byrne. Oxford, 1982. ISBN0-19-821744-7.
