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For other uses, see O'Brien dynasty (disambiguation).
O'Brien Clan

Armorial of O'Brien
Parent houseDalcassians
CountryKingdom of Munster, Kingdom of Thomond
Founded978
FounderBrian Boru
Current headConor O'Brien, 18th Baron Inchiquin
Final rulerMurrough O'Brien, King of Thomond
Titles

The O'Brien Clan is a royal and noble dynasty founded in the Middle Ages by a member of the Dalcassian tribe known as Brian Boru. After becoming King of Munster, through conquest Boru established himself as High King of Ireland, breaking the centuries hold of the title by the O'Neill. Boru's descendants thus carried the name O'Brien, continuing to rule the Kingdom of Munster until the 12th century where their territory had shrunk to the Kingdom of Thomond which they would hold for just under five centuries.

In total, four O'Brien monarchs ruled Munster and held the High Kingship of Ireland between the years 978 and 1119. After the partition of Munster into Thomond and Desmond, the dynasty would go on to provide around thirty monarchs of Thomond until 1542. During part of this period in the late 13th century they had a rivalry, with the Norman de Clare house disputing the throne. The last O'Brien monarch to reign was Murrough O'Brien who surrendered his sovereignty to the House of Tudor's Kingdom of Ireland, becoming instead Earl of Thomond and maintaning a role in governance. Today the head carries the title of Baron Inchiquin.

Throughout the time that the O'Briens reigned as monarchs, the system of tanistry was used to decide succession, rather than the system of primogeniture used by much of feudal Europe. The system in effect was a dynastic monarchy with meritocracy overtones, where the succesor was chosen from a selection of close paternal family roydammna (those of kingly material) rather than automatically passing to the eldest son. This sometimes led to bitter quarrels and in-family warring. Since 1542, the head of the O'Brien house adopted primogenture to decide succession of noble titles instead.

Background

The O'Briens emerged as chiefs of the Dalcassian race from the south-west of Ireland — a cohesive set of septs, related by blood, all claiming descent in tradition from a common ancestor of Cormac Cas.[1] In the Annals of the Four Masters, the father of Cormac Cas was said to be Oilioll Olum, who was according to tradition King of Munster and King of Leinster in the 3rd century.[1] Such a connection would have meant that the race held kinship with the Eoghanachta who had dominated Munster since the earliest times.[2] While founder mythologies were very common in antiquity and the medieval world, such a connection is generally regarded as fanciful and politically motivated in the context of the rise to prominence of the Dalcassians.[2]

The Dalcassians first became a force on the banks of the Shannon.

Instead, academic histories generally accept the Dalcassians as being the Déisi Tuisceart, after adopting a new name — first recorded under their newly adopted name under the year 934 in the Annals of Inisfallen.[2] The Déisi a people whos name means literally vassals, were originally located where today is Waterford, south Tipperary and Limerick;[3] the O'Rahilly's historical model counts them as ethnically Érainn; the sept split into the Déisi Muman who continued to hold territory in Waterford and Tipperary, while the west Déisi controlled areas either side of the River Shannon.[3] During the 8th century, the latter was further divided into the Déisi Deiscirt and the Déisi Tuisceart who would become the Dalcassians.[2][4]

It was during this century that the race annexed to Munster the area today known as Clare and made it their home. Taken from the weakened Uí Fiachrach Aidhne it had previously been part of Connacht but was renamed Thomond (Tuamhain, meaning North Munster). After gaining influence over other tribes in the area such as the Corco Mruad and Corco Baiscinn, the Dalcassians were able to crown Cennétig mac Lorcáin as King of Thomond, he died in 951.[4] His son Mathgamain mac Cennétig was to expand their territory further according to the Annals of Ulster; capturing the Rock of Cashel capital of the Eoghanachta, the Dalcassians became Kings of Cashel and Munster over their previous overlords for the first time in history.[2]

Mathgamain along with his younger brother Brian Boru began military campaigns such as the Battle of Sulchoid, against the Norse Vikings of the settlement Limerick. The Dalcassians were successful, plundering spoils of jewels, gold and silver, saddles, finding "soft, youthful, bright girls, booming silk-clad women and active well-formed boys".[5][2] The males fit for war were executed at Saingel, while the rest were taken as slaves.[5] Through much of his reign Mathgamain was competing with his Eoghanachta rival Máel Muad mac Brain.[4] Mathgamain was only defeated in the end by a piece of trechery; he believed he was attending a friendly meeting, but was betrayed at the Donovan's house, handed over to his enemies and executed in 976.[6] The crown of Munster was briefly back in the hands of the Eoghanachta for two years until Brian Boru had thoroughly avenged his brother.[7]

Rise of Brian Boru

Brian Boru, High King.

The following year Brian came to blows with the Norsemen of Limerick at Scattery Island where a monastery was located. Whilst all parties were Christians, when their king Imar and his sons took refuge in the monastery, Brian desecrated it and killed them in the sanctuary; the Vikings of Limerick had earlier killed Brian's mother.[8] Following this the Dalcassians came into conflict with those responsible for the death of Mathgamain, the Eoghanachta represented by Donovan and Molloy. A message was sent to Molloy, where Boru's son Murrough would challenge him in single combat; eventually the Battle of Belach Lechta took place where Molloy along with 1200 of his soldiers were slain. Brian Boru was now the King of Munster.[5]

Leth Cuinn and Leth Mogha

Sources

Notes

  1. ^ a b O'Dugan, The Kings of the Race of Eibhear, 9.
  2. ^ a b c d e f Duffy, Medieval Ireland, 121.
  3. ^ a b Fitzpatrick, Royal Inauguration in Gaelic Ireland C. 1100-1600, 36.
  4. ^ a b c Koch, Celtic Culture, 554.
  5. ^ a b c Frances Cusack, Ireland, 294.
  6. ^ Corbishley, The Young Oxford History of Britain & Ireland, 82.
  7. ^ Lydon, The Making of Ireland, 31.
  8. ^ Fitzroy Foster, The Oxford History of Ireland, 37.

References

  • Frances Cusack, Mary (1868). Ireland. Plain Label Books. ISBN 160303630X. {{cite book}}: External link in |title= (help)
  • Corbishley, Mike & O'Morgan, Kenneth (1998). The Young Oxford History of Britain & Ireland. Oxford University Press. ISBN 0199104662. {{cite book}}: External link in |title= (help)CS1 maint: multiple names: authors list (link)
  • Lydon, James F (1998). The Making of Ireland. Routledge. ISBN 0415013488. {{cite book}}: External link in |title= (help)
  • O'Dugan, John (1999). The Kings of the Race of Eibhear. Gryfons Publishers & Distributors. ISBN 0965422062. {{cite book}}: External link in |title= (help)
  • Fitzroy Foster, Robert (2001). The Oxford History of Ireland. Oxford University Press. ISBN 019280202X. {{cite book}}: External link in |title= (help)
  • Fitzpatrick, Elizabeth (2004). Royal Inauguration in Gaelic Ireland C. 1100-1600. Boydell Press. ISBN 1843830906. {{cite book}}: External link in |title= (help)
  • Duffy, Seán (2005). Medieval Ireland. CRC Press. ISBN 0415940524. {{cite book}}: External link in |title= (help)
  • Koch, John T (2006). Celtic Culture. ABC-CLIO. ISBN 1851094407. {{cite book}}: External link in |title= (help)

See also

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