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Brian Bóruma mac Cennétig, (c. 941–23 April 1014), (English: Brian Boru, Middle Irish: Brian Bóruma, Irish: Brian Bóroimhe), was an Irish king who ended the domination of the High Kingship of Ireland by the Uí Néill. Building 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, making himself ruler of the south of Ireland. He is the founder of the O'Brien dynasty.