Muirchertach Muimhnech Ua Conchobair
He was one of three sons of Tairdelbach arrested in 1156 by their brother, Ruaidrí Ua Conchobair, on the death of their father. Ruaidrí was his father's Tánaiste, but secured Muirchertach, Brian Breifneach and Brian Luighneach to prevent them gaining the kingship. As an extra precaution, Brian Breifneach was blinded. Before his death Muirchertach became Tánaiste himself and held control of much of Mayo. His sons were subsequently expelled from this area in the conquest of Connacht by Richard Mór de Burgh, 1st Baron of Connaught in 1235.
His wife died in 1231. She is described in the Annála Connacht as:
- "..Feth fo lige, daughter of Conchobar Mac Diarmata and wife of Muirchertach Muimnech son of Toirrdelbach Mor O Conchobair, died this year. She was the greatest, most beautiful, most generous, purest woman and of the best repute that ever was in Leth Cuinn, and the mother of Magnus mac Muirchertaig Muimnig and Conchobar Ruad and Tuathal and Toirrdelbach the priest, prior of the church of Peter and Paul".
- Maghnus mac Muirchertaig Ó Conchobair
- Conchobair Ruadh mac Muirchertaig Ó Conchobair (father of Cathal Ó Conchobair and Maghnus Ó Conchobair)
- Tuathal mac Muirchertaig Ó Conchobair
- Toirrdelbach mac Muirchertaig Ó Conchobair
- A Lost Tribe - The Clan Murtagh O'Conors, Katherine Simms, pp. 1-22, Journal of the Galway Archaeological and Historical Society, volume 53, 2001