Tairrdelbach Ua Conchobair

Tairrdelbach Mór Ua Conchobair (1088–1156) became king of Connacht in 1106 after deposing his brother Domnall, and was recognised as High King of Ireland from about 1120. He broke the power of the Ua Briain dynasty of Munster by partitioning the province and crushing its army at the Battle of Móin Mór in 1151.

He campaigned across Ireland and died in 1156 after a reign of fifty years. His son Ruaidrí succeeded him in Connacht and later became High King.