Brian Boru

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Brian Boru
One of the earliest depictions of Brian on the 1723 publication of Dermot O'Connor's translation of Foras Feasa ar Éirinn.[1]
High King of Ireland
Reign	1002 – 1014
Predecessor	Máel Sechnaill mac Domnaill
Successor	Máel Sechnaill mac Domnaill (restored)
King of Munster
Reign	978–1014
Predecessor	Máel Muad mac Brain
Successor	Dúngal mac Máelfothartaig Hua Donnchada
Born	c. 941 Kincora, Killaloe, Kingdom of Munster
Died	23 April 1014 Cluain Tarbh, Kingdom of Leinster
Consort	Mór Echrad Gormflaith Dub Choblaig
Issue	Murchad Conchobar Flann Tadc Donnchad Domhnall Kerthialfad (adopted) Sadb Bé Binn Sláine
House	O'Brien
Father	Cennétig mac Lorcáin
Mother	Bé Binn inion Urchadh
Religion	Catholic Church

Brian Boru (Middle Irish: Brian Bóruma mac Cennétig; modern Irish: Brian Bóramha; c. 941 – 23 April 1014) 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.^[2] Brian Boru was mentioned in Annals of Inisfallen and Chronicon Scotorum as "Brian mac Cennétig" (Brian, son of Cennétig).^[3][4] The name Brian of Bóruma or Brian Boru was given to him posthumously^[5] 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.

With a population of under 500,000 people, Ireland had over 150 kings, with greater or lesser domains.^[6] The Uí Néill king Máel Sechnaill mac Domnaill, abandoned by his northern kinsmen of the Cenél nEógain and Cenél Conaill, acknowledged Brian as High King at Athlone in 1002. In the decade that followed, Brian campaigned against the northern Uí Néill, who refused to accept his claims, against Leinster, where resistance was frequent, and against the Norse-Gaelic Kingdom of Dublin. Brian was described in the Annals of Ulster as ardrí Gaidhel Erenn & Gall & Bretan, August iartair tuaiscirt Eorpa uile (High King of the Gaels of Ireland and the Norse foreigners and the Britons, Augustus of all north-western Europe), the only Irish king to receive that distinction in the annals.^[7]

Brian's hard-won authority was seriously challenged in 1013 when his ally Máel Sechnaill was attacked by the Cenél nEógain king Flaithbertach Ua Néill, with the Ulstermen as his allies. This was followed by further attacks on Máel Sechnaill by the Germanic Norsemen of Dublin under their Norse king Sigtrygg Silkbeard and the Leinstermen led by Máel Mórda mac Murchada. Brian campaigned against these enemies in 1013. In 1014, his armies confronted the armies of Leinster and Dublin. In the resulting Battle of Clontarf Brian was killed; nonetheless, his army was victorious against the Leinstermen and Norsemen. The battle is widely lauded as a pivotal moment in Irish history, and is well known in popular memory.

Brian was well regarded by contemporary chroniclers. The Norse-Gaels and Scandinavians also produced works mentioning Brian, including Njal's Saga, the Orkneyinga Saga, and the now-lost Brian's Saga. Brian's war against Máel Mórda and Sigtrygg was to be inextricably connected with his complicated marital relations, in particular his marriage to Gormlaith, Máel Mórda's sister and Sigtrygg's mother, who had been in turn the wife of Amlaíb Cuarán, king of Dublin and York, then of Máel Sechnaill, and finally of Brian himself.