Ruaidrí mac Tairrdelbach Ua Conchobair was King of Connacht from 1156 to 1186, and High King of Ireland from 1166 to 1198. He was the last High King of Ireland before the Anglo-Norman invasion.
Stone carving, Cong Abbey
High King of Ireland was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and was later sometimes assigned anachronously or to legendary figures.
Anachronistic depiction of High King Brian Boru
High kings were traditionally installed on the Hill of Tara. The Lia Fáil (pictured) shouted the rightful king's name when he placed his foot on it, according to tradition.