Brian Boru

Article abstract: Military significance: Brian Boru broke the Uí’Néill monopoly on the high kingship, diminished Viking power, and temporarily united Ireland under one king

Brian Boru succeeded his brother, Mathgamain, as king of Dál Cais and Munster after Mathgamain’s murder in 976. He immediately killed his brother’s assassins and subjugated the rest of Limerick and Munster within three years, followed by Connacht and Leinster. Brian then defeated Mael Sechnaill, the Uí’Néill king of the south, at Clonfert in 997, and they divided the overlordship...

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