Tairrdelbach Ua Conchobair

Toirdhealbhach Ua Conchobair
King of Ireland
Reign	1119-1156
Successor	Muircheartach Mac Lochlainn
Issue	26
Dynasty	O'Conor
Father	Ruaidrí na Saide Buide
Mother	Mór Ua Briain

Toirdhealbhach Ua Conchobhair (old spelling: Tairrdelbach Ua Conchobair) (1088–1156), anglicised Turlough Mór O'Connor / O'Conor, was King of Connacht (1106–1156) and High King of Ireland (ca. 1120–1156).

The youngest son of Ruaidrí na Saide Buide (died 1118), his mother was Mór, daughter of Toirdelbach Ua Briain (1009–14 July 1086). His brothers were Niall (killed 1093), Tadc (killed 1097), Conchobar (murdered 1103), Domnall, King of Connacht (deposed 1106). There was at least one sister, Dubhchobhlaigh Bean Ua hEaghra of Luighne Connacht (died 1131). Ruaidrí was married to four or more women.

In 1092, King Ruaidrí was blinded by Flaithbertaigh Ua Flaithbertaigh, an incident which led to the domination of Connacht by the Dal gCais of Munster, led by Tairrdelbach's uncle, Muirchertach Ua Briain, who possibly took Tairrdelbach into his household to groom him for the day when he would be king of Connacht. (p. 471,MIAE 2005)

However this would not occur until 1106; until then, Connacht endured a prolonged period of civil strife between different factions of the Uí Conchobair, Uí Ruairc of Bréifne as well as more minor families of the Uí Briúin and Síol Muireadaigh, including the long-displaced Ui Fiachrach Aidhne. Tairrdelbach's brothers Tadc and Domnall both gaining the kingship at different times, but depended upon the support of Ua Briain.

In 1106, with the support of his uncle Muirchertach Ua Briain, eighteen-year-old Tairrdelbach deprived his older brother Domnall of the kingship of Connacht. "Tairrdelbach carefully maintained his alliance with Ua Briain, sending troops to aid the high king against the Ui Ruaric of Bréifne in 1109. But he was also determined to defend his kingdom against predators such as Domnall Mac Lochlainn (d. 1121), king of the north of Ireland." (O'Byrne, p. 471)

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