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Wiki information Muirchertach:
Muircheartach Ua Briain, son of Toirdelbach Ua Briain and great-grandson of Brian Bóruma, was King of Munster and later self-declared High King of Ireland.
Muircheartach Mac Lochlainn was king of the Cenél nEógain, Tyrone and High King of Ireland from around 1156 until his death in 1166. He succeeded Toirdhealbhach Ua Conchobhair who died in 1156. Mac Lochlainn survived an attempt by Ruaidrí Ua...