Muirchertach Ua Briain
Muircheartach Ua Briain (old spelling: Muirchertach Ua Briain) (c. 1050 – c. 10 March 1119), son of Toirdelbach Ua Briain and great-grandson of Brian Bóruma, was King of Munster and later self-declared High King of Ireland.
Muirchertach Ó Briain was a son of Toirdelbach Ua Briain, a previous Dalcassian king of Ireland. In 1086 his father died and the province of Munster from which he had claimed kingship of Ireland had been split between his three sons: Tadc, Muirchertach and Diarmait. Tadc died soon after, and Muirchertach banished Diarmait from Munster, claiming its kingship for himself.
King of Munster
Between 1086 and 1101, Muirchertach consolidated and strengthened his position as King of Munster. He went on forays into Mide and Leinster in 1089 and took the kingship of Leinster and fought for the Viking Kingdom of Dublin. In 1093, he accepted the submission of Domnall mac Flainn Ua Maíl Shechnaill, the Uí Néill king of Tara, and also made peace with his brother Diarmait at Cashel.
King of Ireland with opposition
In 1094, Muirchertach fought the kings of Leth Cuinn and Gofraid, king of Dublin. He went with his army to Dublin and banished Gofraid, and brought about the killing of Domnall Ua Maíl Shechnaill. He asserted supremacy over the Uí Néill kingdom of Mide.
Alliance with Arnulf de Montgomery
In an effort to gain military support against Henry I, Arnulf de Montgomery sent his steward, Gerald of Windsor, to Ireland to negotiate terms with Muirchertach. According to a Welsh chronicle (Sean Duffy, p. 45, 1997), Arnulf "though to make peace with the Irish and to obtain help from them. And he sent messengers to Ireland, that is Gerald the Steward (Gerald of Winsor) and many others, to ask for the daughter of King Murtart for his wife. And that he easily obtained; and the messengers came joyfully to their land. And Murtart sent his daughter and many armed ships along with her to his aid. And when the earls had exalted themselves with pride because of those events, they refused to accept any peace from the king."
De Montgomery and his brother Robert, were however defeated by Henry and fled to Ireland. The Montgomery brothers fought under Muirchertach during his campaign with Magnus Barelegs, but when de Montgomery attempted to seize the kingship for himself, Muirchertach "took his daughter away from Arnulf and gave the wanton girl in an unlawful marriage to one of his cousins. He resolved to kill Arnulf himself as a reward for his alliance, but the latter ... fled to his own people and lived for twenty years afterwards with no fixed abode." (Sean Duffy, 1997, p. 46). Despite their checkered relationship, some sources list Lafracoth, the daughter of Muirchertach, as the mother of two daughters by Arnulf, Alice de Montgomery and Marie de Montgomery.
In 1102, Muirchertach cemented an alliance with Magnus Barefoot, king of Norway by marrying his daughter Blathmin Ua Briain to Magnus's son, Sigurd I Magnusson. Muirchertach now took part in a campaign with Magnus to assert control over Ulster, successfully defeating opposing Irish forces. After a year of campaigning, as his army was readying to depart back to Norway, King Magnus was ambushed and killed by an Irish army in Ulster. With Magnus's death, Muirchertach's daughters marriage was disavowed by the Norwegians, weakening Muirchertachs proclaimed position as High King.
In 1114 the king became sick to the point where "he became a living skeleton". In response to the king's misfortune, his brother Diarmait took control of the kingship of Munster and banished Muirchertach. The following year Muirchertach regained his strength and undertook a campaign to regain control of Munster and successfully captured Diarmait. Only later did the king regain control of Munster.
In 1119, Muirchertach Ua Briain died.
Anthony Condon (1979, p. 398) remarked of Ó Briain:
"Muirchertach Ó Briain was an ambitious, modernising and outward-looking king whose goal was to make himself king of Ireland as much as William Rufus and Henry I were kings of England; in reality his position was, perhaps, more analogous to that of Philip I in France ... but his actually authority in Ireland, especially at the height of his power in the first years of the twelfth century, greatly exceeded that of Phillip in France. ... Ua Briain ... pursued a vigorous foreign policy which was to carry his activities beyond his own shores."
In the latter regard, Condon (1979, p. 415) views "Ua Briain's activities in the Irish Sea area [as] a mixture of old and new, of pragmstisim and idealism ... But they are invested with a modern purpose. Ua Briain makes one marriage with the king of Norway, and another with one of the most powerful non-royal families in Europe; he treats with the king of Scotland; his aid to the Welsh princes acts as a stabilising influence in Welsh politics; he incurs trade sanctions from the king of England, and negotiates their suspension. Altogether, Muirchertach Ó Briain lifted his head above the domestic power struggle and sought to involve Ireland in the international politics of Europe, so that some sixty years later, these activities were still well remembered, and are reflected in the vitae of St. Flannan of Killaloe."
- Annals of Innisfallen, CELT: The Corpus of Electronic Texts, 2000, retrieved 10 May 2008
- Annals of Loch Cé A.D. 1014–1590, CELT: The Corpus of Electronic Texts, 2002, retrieved 10 May 2008
- Annals of Ulster AD 431–1201, CELT: The Corpus of Electronic Texts, 2003, retrieved 10 February 2007
- Chronicon Scotorum, CELT: The Corpus of Electronic Texts, 2003, retrieved 25 October 2007
- Bracken, Damian (2004), "Ua Briain, Muirchertach [Murtagh O'Brien] (c.1050–1119)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 6 March 2008
- Bracken, Damian (2004), "Ua Briain, Toirdelbach [Turlough O'Brien] (1009–1086)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 6 March 2008
- Byrne, Francis John (2005), "Ireland and her neighbours, c.1014–c.1072", in Ó Cróinín, Dáibhí, Prehistoric and Early Ireland, A New History of Ireland I, Oxford: Oxford University Press, pp. 862–898, ISBN 0-19-922665-2
- Byrne, Francis John (1973), Irish Kings and High-Kings, London: Batsford, ISBN 0-7134-5882-8
- Etchingham, Colman (2007), "Viking age Gwynedd and Ireland: political relations", in Jankulak, Karen; Wooding, Jonathan M., Ireland and Wales in the Middle Ages, Dublin: Four Courts Press, pp. 149–167, ISBN 978-1-85182-748-0
- Flannagan, Marie Therese (2005), "High-kings with opposition, 1072–1166", in Ó Cróinín, Dáibhí, Prehistoric and Early Ireland, A New History of Ireland I, Oxford: Oxford University Press, pp. 899–933, ISBN 0-19-922665-2
- Flanagan, Marie Therese; Harrison, B. (2004), "Ua Lochlainn, Domnall", Oxford Dictionary of National Biography, doi:10.1093/ref:odnb/20744, retrieved 7 January 2008
- Griffin, Patrick C. (2002), The Mac Lochlainn High-Kingship in Late Pre-Norman Ireland., Unpublished M. Phil. thesis, Trinity College Dublin, retrieved 11 May 2008
- Hudson, Benjamin (2004), "Diarmait mac Máel na mBó (d. 1072)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 6 March 2008
- Hudson, Benjamin (2005), Viking Pirates and Christian Princes: Dynasty, Religion and Empire in the North Atlantic, Oxford: Oxford University Press, ISBN 0-19-516237-4, OCLC 55286670 Unknown parameter
- Lydon, James (2003), The Lordship of Ireland in the Middle Ages (2nd ed.), Dublin: Four Courts Press, ISBN 1-85182-737-4
- Ó Cróinín, Dáibhí (1995), Early Medieval Ireland: 400–1200, London: Longman, ISBN 0-582-01565-0
- Power, Rosemary (2005), "Meeting in Norway: Norse-Gaelic relations in the kingdom of Man and the Isles, 1090–1272", Saga-Book (London: Viking Society for Northern Research) XXIX: 5–66, ISSN 0305-9219
- Simms, Katherine (2004), "Ua Conchobair, Toirdelbach Mór (1088–1156) [Turlough the Great O'Connor] (1088–1156)", Oxford Dictionary of National Biography, Oxford: Oxford University Press, retrieved 6 March 2008
- Sturluson, Snorri (1964), Hollander, Lee M., ed., Heimskringla: History of the Kings of Norway, Austin: University of Texas Press, ISBN 0-292-73061-6
- Muirchertach Ua Briain, Politics and Naval Activity in the Irish Sea, 1075 to 119, Anthony Candon, in Keimelia:Studies in Medieval Archaeology and History in memory of Tom Delaney, pp. 397–415. ed Gearoid Mac Nicoill, Galway, 1979
- Ireland in the Middle Ages, pp. 41–47, 48, 51–53.