Brian Boru was an Irish king who ended the domination of the High Kingship of Ireland by the Uí Néill, and possibly ended Viking invasions of Ireland. Brian Boru was mentioned in Annals of Inisfallen and Chronicon Scotorum as "Brian mac Cennétig". The name Brian of Bóruma or Brian Boru was given to him posthumously Brian built on the achievements of his father, Cennétig mac Lorcain, and especially his elder brother, Mathgamain. Brian first made himself king of Munster, then subjugated Leinster, eventually becoming High King of Ireland. He was the founder of the O'Brien dynasty, and is widely regarded as one of the most successful and unifying monarchs in medieval Ireland.
One of the earliest depictions of Brian on the 1723 publication of Dermot O'Connor's translation of Foras Feasa ar Éirinn.
Banner reputedly used by Brian of which the Clare GAA colours are based.
Oil painting of Battle of Clontarf by Hugh Frazer 1826
Brian on the Morning of Clontarf
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.