He was born around 940, the youngest of two sons of Cennedig, head of Dal Cais, one of the royal free tribes of Munster.
Brian grew up during the worst days of tyranny when the Dacassians had driven in to the present county of Clare.
His brother, Mahon, had become King of Munster in 951, upon the death of their father. Together they fought against the invading Norsemen, who had imposed taxes in Munster. This struggle eventually led to the murder of Mahon.
Brian avenged his brother’s death by killing the king of the Ostermen (Norse) of Limerick, King Imar.
From this point onwards Brian held Munster as his own. He marched into Connaught and Leinster and joined forces with Mael Sechnaill II in 997. Together they divided Ireland between them.
The Norse settlers in Dublin ranged against Brian but were defeated at Glen Mama where the King of Leinster was captured. The King of Dublin, Sitric Silkenbeard, was soon defeated too.
In 1002 Brian demanded of Mael Seachnaill that he recognizes him as King of Ireland. Mael agreed, partially because many of his own people viewed Brian as a hero who had restored Ireland to greatness after the Viking invasions.
Brian earned his name as ‘Brian of the Tributes’ by collecting tributes from the minor rulers of Ireland and used the money raised to restore monasteries and build new churches. He sent overseas to replace lost books and artefacts that had been destroyed during the invasions.
He reigned for thirty-nine years. It was a time of unsurpassed glory, prosperity and happiness.
He promoted the arts and learning. He is credited with having originated surnames. His patriotism and personal sacrifice brought the clans together, under one King, for the only time in Irish history.
The Norsemen were not done yet however, and once more waged war on Brian Boru and his followers at Clontarf in Dublin.
Despite the lack of backing from the men of Connaught, the Munstermen won the day but lost Brian in the battle.
This was a major turning point as it finally subjugated the Norse presence in Ireland who were considered subordinate to the Kinships of Ireland.
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