'''Brian Boru''' was the only emperor of all [[Ireland]]. He lived AD 941 to April 23, 1014 and ruled 1002 to 1014.
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'''Brian Boru''' (941 - April 23rd, 1014) was emperor of all [[Ireland]]. A clan prince, he first subjugated Munster and then extended his power over all of southern Ireland. Finally, in 1002 he had conquered all of Ireland.
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Ruling from 1002 to 1014, he came into conflict with the Norse inhabitants who formed a coalition against him. Brian defeated them at the [[Battle of Clontarf]], but he murdered in his tent shortly thereafter. Brian's victory had broke the Norse power in Ireland forever, but his untimely death plunged Ireland into anarchy.