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The O'Brien dynasty (; ; genitive ''Uí Bhriain'' ) was an Irish Clan and
noble A noble is a member of the nobility. Noble may also refer to: Places Antarctica * Noble Glacier, King George Island * Noble Nunatak, Marie Byrd Land * Noble Peak, Wiencke Island * Noble Rocks, Graham Land Australia * Noble Island, Gr ...
house of
Munster Munster ( or ) is the largest of the four provinces of Ireland, located in the south west of the island. In early Ireland, the Kingdom of Munster was one of the kingdoms of Gaelic Ireland ruled by a "king of over-kings" (). Following the Nor ...
, founded in the 10th century by
Brian Boru Brian Boru (; modern ; 23 April 1014) was the High King of Ireland from 1002 to 1014. He ended the domination of the High King of Ireland, High Kingship of Ireland by the Uí Néill, and is likely responsible for ending Vikings, Viking invasio ...
of the
Dál gCais The Dalcassians ( ) are a Gaels, Gaelic Irish clan, generally accepted by contemporary scholarship as being a branch of the Déisi Muman, that became very powerful in Ireland during the 10th century. Their genealogies claimed descent from Tál ...
(Dalcassians). After becoming
King of Munster The kings of Munster () ruled the Kingdom of Munster in Ireland from its establishment during the Irish Iron Age until the High Middle Ages. According to Gaelic traditional history, laid out in works such as the ''Book of Invasions'', the earli ...
, through conquest he established himself as ''Ard Rí na hÉireann'' (
High King of Ireland High King of Ireland ( ) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and was later sometimes assigned anachronously or to leg ...
). Brian's descendants thus carried the name Ó Briain, continuing to rule the
Kingdom of Munster The Kingdom of Munster () was a kingdom of Gaelic Ireland which existed in the south-west of the island from at least the 1st century BC until 1118. According to traditional Irish history found in the ''Annals of the Four Masters'', the kingdom ...
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 Ó Briains ruled in Munster, and two held the High Kingship of Ireland (with opposition). After the partition of Munster into Thomond and the MacCarthy
Kingdom of Desmond The Kingdom of Desmond () was a historic kingdom in southwestern Ireland. It was founded in 1118 by Tadhg Mac Cárthaigh, King of Munster when the Treaty of Glanmire formally divided the Kingdom of Munster into Desmond and Thomond (, "North ...
by
Tairrdelbach Ua Conchobair Toirdhealbhach Mór Ua Conchobhair (old spelling: Tairrdelbach Mór Ua Conchobair; 1088 – 1156) anglicised Turlough Mór O'Conor, was King of Connacht (1106–1156) and High King of Ireland (ca. 1120–1156). Family background and early life ...
in the 12th century, 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 The House of Clare was a prominent Anglo-Norman noble house that ruled the Earldoms of Pembroke, Hertford and Gloucester in England and Wales throughout its history, playing a prominent role in the Norman invasion of Ireland. They were desce ...
house, disputing the throne of Thomond. The last Ó Briain to reign in Thomond was Murrough Ó Briain who surrendered his sovereignty to the new
Kingdom of Ireland The Kingdom of Ireland (; , ) was a dependent territory of Kingdom of England, England and then of Kingdom of Great Britain, Great Britain from 1542 to the end of 1800. It was ruled by the monarchs of England and then List of British monarchs ...
under
Henry VIII Henry VIII (28 June 149128 January 1547) was King of England from 22 April 1509 until his death in 1547. Henry is known for his Wives of Henry VIII, six marriages and his efforts to have his first marriage (to Catherine of Aragon) annulled. ...
of the
House of Tudor The House of Tudor ( ) was an English and Welsh dynasty that held the throne of Kingdom of England, England from 1485 to 1603. They descended from the Tudors of Penmynydd, a Welsh noble family, and Catherine of Valois. The Tudor monarchs ruled ...
, becoming instead
Earl of Thomond Earl of Thomond was an hereditary title in the Peerage of Ireland. It was created twice for the O'Brien dynasty which is an ancient Irish sept native to north Munster. History and background First creation Under the Crown of Ireland Act 1542, K ...
and maintaining a role in governance. Throughout the time that the Ó Briains ruled in medieval Ireland, the system of
tanistry Tanistry is a Gaelic system for passing on titles and lands. In this system the Tanist (; ; ) is the office of heir-apparent, or second-in-command, among the (royal) Gaelic patrilineal dynasties of Ireland, Scotland and Mann, to succeed to ...
was used to decide succession, rather than
primogeniture Primogeniture () is the right, by law or custom, of the firstborn Legitimacy (family law), legitimate child to inheritance, inherit all or most of their parent's estate (law), estate in preference to shared inheritance among all or some childre ...
used by much of feudal
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. The system in effect was a dynastic monarchy but family-elected and
aristocratic Aristocracy (; ) is a form of government that places power in the hands of a small, privileged ruling class, the aristocrats. Across Europe, the aristocracy exercised immense economic, political, and social influence. In Western Christian co ...
, in the sense that the royal family chose the most suitable male candidate from close paternal relations—''roydammna'' (those of kingly material) rather than the crown automatically passing to the eldest son. This sometimes led to bitter quarrels and in-family warring. Since 1542, as a part of the
Peerage of Ireland The peerage of Ireland consists of those Peerage, titles of nobility created by the English monarchs in their capacity as Lordship of Ireland, Lord or Monarchy of Ireland, King of Ireland, or later by monarchs of the United Kingdom of Great B ...
, the head of the Ó Briain house adopted primogeniture to decide succession of noble titles instead.


Naming conventions


Background

The Ó Brian emerged as chiefs of the
Dál gCais The Dalcassians ( ) are a Gaels, Gaelic Irish clan, generally accepted by contemporary scholarship as being a branch of the Déisi Muman, that became very powerful in Ireland during the 10th century. Their genealogies claimed descent from Tál ...
tribe from the south-west of Ireland and according to historian C. Thomas Cairney, the Dál gCais had come from the tribe of Erainn who were the second wave of
Celts The Celts ( , see Names of the Celts#Pronunciation, pronunciation for different usages) or Celtic peoples ( ) were a collection of Indo-European languages, Indo-European peoples. "The Celts, an ancient Indo-European people, reached the apoge ...
to settle in Ireland from about 500 to 100 BC. They were a cohesive set of septs, related by blood, all claiming descent in tradition from a common ancestor of Cas, sixth in descent from Cormac Cas.O'Dugan, ''The Kings of the Race of Eibhear'', 9. In the ''
Annals of the Four Masters The ''Annals of the Kingdom of Ireland'' () or the ''Annals of the Four Masters'' () are chronicles of Middle Ages, medieval Irish history. The entries span from the Genesis flood narrative, Deluge, dated as 2,242 Anno Mundi, years after crea ...
'', the father of Cormac Cas was said to be Oilioll Olum, who was according to tradition
King of Munster The kings of Munster () ruled the Kingdom of Munster in Ireland from its establishment during the Irish Iron Age until the High Middle Ages. According to Gaelic traditional history, laid out in works such as the ''Book of Invasions'', the earli ...
and King of Leinster in the 3rd century. Such a connection would have meant that the tribe held kinship with the Eoghanachta, a dynasty who had dominated Munster since the earliest times.Duffy, ''Medieval Ireland'', 121. 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. Instead, academic histories generally accept the Dalcassians as being the Déisi Tuaisceart, after adopting a new name — first recorded under their newly adopted name under the year 934 in the ''
Annals of Inisfallen The ''Annals of Inisfallen'' () are a chronicle of the medieval history of Ireland. Overview There are more than 2,500 entries spanning the years between 433 and 1450. The manuscript is thought to have been compiled in 1092, as the chronic ...
''. The
Déisi The ''Déisi'' were a social class in Ireland between the ancient and early medieval period. The various peoples listed under the heading ''déis'' shared a similar status in Gaelic Ireland, and had little or no actual kinship, though they were ...
, a people whose name means literally ''vassals'', were originally located where today are south
County Tipperary County Tipperary () is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Provinces of Ireland, province of Munster and the Southern Region, Ireland, Southern Region. The county is named after the town of Tipperary (tow ...
and counties
Waterford Waterford ( ) is a City status in Ireland, city in County Waterford in the South-East Region, Ireland, south-east of Ireland. It is located within the Provinces of Ireland, province of Munster. The city is situated at the head of Waterford H ...
and
Limerick Limerick ( ; ) is a city in western Ireland, in County Limerick. It is in the Provinces of Ireland, province of Munster and is in the Mid-West Region, Ireland, Mid-West which comprises part of the Southern Region, Ireland, Southern Region. W ...
;Fitzpatrick, ''Royal Inauguration in Gaelic Ireland C. 1100-1600'', 36. the O'Rahilly's historical model counts them as ethnically
Érainn The Iverni (, ') were a people of early Ireland first mentioned in Ptolemy's 2nd century ''Geography'' as living in the extreme south-west of the island. He also locates a "city" called Ivernis (, ') in their territory, and observes that this se ...
. 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 The River Shannon ( or archaic ') is the major river on the island of Ireland, and at in length, is the longest river in the British Isles. It drains the Shannon River Basin, which has an area of , – approximately one fifth of the area of I ...
. During the 8th century, the latter was further divided into the Déisi Deiscirt and the Déisi Tuaisceart who would become the Dalcassians.Koch, ''Celtic Culture'', 554. Prehistoric ancestors of the Déisi Tuisceart and Dál gCais may have been a once prominent Érainn people called the
Mairtine The Mairtine (Martini, Marthene, Muirtine, Maidirdine, Mhairtine) were an important people of late prehistoric Munster, Ireland who by early historical times appear to have completely vanished from the Irish political landscape. They are notable f ...
. It was during this century that the tribe 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 Connacht or Connaught ( ; or ), is the smallest of the four provinces of Ireland, situated in the west of Ireland. Until the ninth century it consisted of several independent major Gaelic kingdoms (Uí Fiachrach, Uí Briúin, Uí Maine, C ...
but was renamed Thomond (''Tuamhain'', meaning North Munster). After gaining influence over other tribes in the area such as the Corcu Mruad and
Corcu Baiscinn The Corcu Baiscind were an early Érainn people or kingdom of what is now southern County Clare in Munster. They descended from Cairpre Baschaín, son of Conaire Cóem, a High King of Ireland. Closely related were the Múscraige and Corcu Dui ...
, the Dalcassians were able to crown Cennétig mac Lorcáin as
King of Thomond The kings of Thomond () ruled from the establishment of Thomond during the High Middle Ages, until the Early modern period. Thomond represented the legacy of Brian Bóruma and the High Kings of Ireland of his line who could not hold onto all of ...
, he died in 951. His son
Mathgamain mac Cennétig Mathgamain mac Cennétig (also known as Mahon) was King of Munster from around 970 to his death in 976. He was the elder brother of Brian Bóruma. Mathgamain was the son of Cennétig mac Lorcáin of the Dál gCais. His father died in 951 and is ...
was to expand their territory further according to the ''
Annals of Ulster The ''Annals of Ulster'' () are annals of History of Ireland, medieval Ireland. The entries span the years from 431 AD to 1540 AD. The entries up to 1489 AD were compiled in the late 15th century by the scribe Ruaidhrí Ó Luinà ...
''; capturing the
Rock of Cashel The Rock of Cashel ( ), also known as Cashel of the Kings and St. Patrick's Rock, is a historical site located dramatically above a plain at Cashel, County Tipperary, Cashel, County Tipperary, Republic of Ireland, Ireland. History According t ...
capital of the Eoghanachta, the Dalcassians became Kings of Cashel and Munster over their previous overlords for the first time in history. Mathgamain along with his younger brother
Brian Boru Brian Boru (; modern ; 23 April 1014) was the High King of Ireland from 1002 to 1014. He ended the domination of the High King of Ireland, High Kingship of Ireland by the Uí Néill, and is likely responsible for ending Vikings, Viking invasio ...
began military campaigns such as the Battle of Sulcoit, against the Norse Vikings of the settlement
Limerick Limerick ( ; ) is a city in western Ireland, in County Limerick. It is in the Provinces of Ireland, province of Munster and is in the Mid-West Region, Ireland, Mid-West which comprises part of the Southern Region, Ireland, Southern Region. W ...
, ruled by Ivar. 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".Frances Cusack, ''Ireland'', 294. The males fit for war were executed at Saingel, while the rest were taken as slaves. Through much of his reign Mathgamain was competing with his Eoghanachta rival Máel Muad mac Brain. Mathgamain was only defeated in the end by a piece of treachery; he believed he was attending a friendly meeting, but was betrayed at Donnubán mac Cathail's house, handed over to his enemies and executed in 976. The crown of Munster was briefly back in the hands of the Eoghanachta for two years until Brian Boru had thoroughly avenged his brother, with the defeat and slaying of Máel Muad in the Battle of Belach Lechta.


Rise of Brian Boru

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 A Christian () is a person who follows or adheres to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. Christians form the largest religious community in the world. The words '' Christ'' and ''C ...
, when their king Ivar and his sons took refuge in the monastery, Brian desecrated it and killed them in the
sanctuary A sanctuary, in its original meaning, is a sacred space, sacred place, such as a shrine, protected by ecclesiastical immunity. By the use of such places as a haven, by extension the term has come to be used for any place of safety. This seconda ...
; the Vikings of Limerick had earlier killed Brian's mother. 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. Donovan was destroyed together with Aralt, his brother-in-law and Ivar's remaining son, newly elected king of the Danes and Foreigners of Munster, in Donovan's fortress of Cathair Cuan, which Brian razed. With this Brian Boru was now the
King of Munster The kings of Munster () ruled the Kingdom of Munster in Ireland from its establishment during the Irish Iron Age until the High Middle Ages. According to Gaelic traditional history, laid out in works such as the ''Book of Invasions'', the earli ...
. Brian's rise did not go unnoticed, however; Máel Sechnaill II from the Clann Cholmáin sept of the
Uí Néill The Uí Néill (; meaning "descendants of Niall") are Irish dynasties that claim descent from Niall Noígíallach (Niall of the Nine Hostages), a historical King of Tara who is believed to have died around c. 405. They are generally divided ...
, as reigning king of Mide and
High King of Ireland High King of Ireland ( ) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and was later sometimes assigned anachronously or to leg ...
marched an army down to Munster to send a warning to the Dalcassians. His army cut down the tree of ''Magh Adhair'', which was sacred to the Dalcassians as it was used as their site of royal inaugurations. This sparked a conflict between Máel Sechnaill and Brian, the object of both men to be recognised as High King. A treaty would eventually be reached between Máel Sechnaill and Brian which split the areas of influence in Ireland between them. Brian gained control over a large portion of the island's south including Dublin. The peace didn't last long as Brian used the newly acquired forces of Dublin and Leinster to spearhead an attack against Máel Sechnaill which ended in their defeat and forced Brian to reconsider pressing any further North. The war dragged on but Brian would eventually force Máel Sechnaill to accept his authority when northern branch of the Uí Néill clan refused to support him. Despite his fall in position Máel Sechnaill would become one of Brian's most important allies. Eventually the northern Uí Néill branch would accept Brian's rule as well, unusually for the time this was done peacefully, their submission to Brian was negotiated by the clergy rather than forced in battle. With the most powerful Kings in Ireland now accepting Brian as the High King it was a much easier task for Brian to force the remaining Kings to submit to his rule and though it may have been tenuous he eventually was acknowledged as High King by all the rulers in Ireland.Bryne, ''Irish Kings and High Kings'',


O'Brien dynasty

Brian's descendants, the Ua Briain provided a further three
High Kings of Ireland High King of Ireland ( ) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and was later sometimes assigned anachronously or to leg ...
and exercised supremacy in
Munster Munster ( or ) is the largest of the four provinces of Ireland, located in the south west of the island. In early Ireland, the Kingdom of Munster was one of the kingdoms of Gaelic Ireland ruled by a "king of over-kings" (). Following the Nor ...
until
Tairrdelbach Ua Conchobair Toirdhealbhach Mór Ua Conchobhair (old spelling: Tairrdelbach Mór Ua Conchobair; 1088 – 1156) anglicised Turlough Mór O'Conor, was King of Connacht (1106–1156) and High King of Ireland (ca. 1120–1156). Family background and early life ...
, taking advantage of war between brothers Diarmait and former High-King Muircheartach, invaded
Munster Munster ( or ) is the largest of the four provinces of Ireland, located in the south west of the island. In early Ireland, the Kingdom of Munster was one of the kingdoms of Gaelic Ireland ruled by a "king of over-kings" (). Following the Nor ...
and split it in two in the Treaty of Glanmire (1118) granting Thomond to the sons of Diarmait Ua Briain and Desmond to the leading sept of the dispossessed Eoganacht, the Mac Cárthaigh dynasty. After the death of
Domnall Mór Ua Briain Domnall Mór Ua Briain, or Domnall Mór mac Toirrdelbaig Uí Briain, was King of Thomond in History of Ireland, Ireland from 1168 in Ireland, 1168 to 1194 in Ireland, 1194 and a claimant to the title King of Munster. He was also styled History ...
, a claimant to the Kingship of Munster, they further retreated beyond the Shannon into the area of modern
County Clare County Clare () is a Counties of Ireland, county in the Provinces of Ireland, province of Munster in the Southern Region, Ireland, Southern part of Republic of Ireland, Ireland, bordered on the west by the Atlantic Ocean. Clare County Council ...
in the wake of the Norman Invasion. In 1276
King Edward II Edward II (25 April 1284 â€“ 21 September 1327), also known as Edward of Caernarfon or Caernarvon, was King of England from 1307 until he was deposed in January 1327. The fourth son of Edward I, Edward became the heir to the throne follo ...
granted all of Thomond to Thomas de Clare, taking advantage of the feuding between Clann Taidhg and Clann Briain (whom de Clare supported). The de Clares failed in conquering Thomond, and were decisively defeated in the Battle of Dysert O'Dea in 1318, thus the Kingdom of Thomond remained outside of foreign control for a further 200 years.The Normans in Thomond, Joe Power http://www.clarelibrary.ie/eolas/coclare/history/norman.htm In 1543 Murchadh Carrach Ó Briain agreed to surrender his Gaelic Royalty to
King Henry VIII Henry VIII (28 June 149128 January 1547) was King of England from 22 April 1509 until his death in 1547. Henry is known for his six marriages and his efforts to have his first marriage (to Catherine of Aragon) annulled. His disagreement w ...
and accepted the titles
Earl of Thomond Earl of Thomond was an hereditary title in the Peerage of Ireland. It was created twice for the O'Brien dynasty which is an ancient Irish sept native to north Munster. History and background First creation Under the Crown of Ireland Act 1542, K ...
and Baron Inchiquin. At his death in 1551 the Earldom passed to his nephew Donough by special remainder, and the title Baron Inchiquin passed to his male heirs through his son Dermot. The Earldom went extinct at the death of Henry O'Brien, 8th Earl of Thomond; the next heir would have been a descendant of Daniel O'Brien, 3rd Viscount Clare who had been attainded in 1691, so the title became forfeit. However, Charles O'Brien, 6th Viscount Clare, a Jacobite exile used the title Earl of Thomond, as did his son, who died childless in 1774. At the death of James O'Brien, 3rd Marquess of Thomond, the title Baron Inchiquin passed to a distant cousin and descendant of Murrough, Sir Lucius O'Brien, 5th Baronet, and was passed down to his descendants.


Family tree

Key: *= King of Dál gCais *=
King of Thomond The kings of Thomond () ruled from the establishment of Thomond during the High Middle Ages, until the Early modern period. Thomond represented the legacy of Brian Bóruma and the High Kings of Ireland of his line who could not hold onto all of ...
*= Baron Inchiquin *= Viscount Clare *=
Earl of Thomond Earl of Thomond was an hereditary title in the Peerage of Ireland. It was created twice for the O'Brien dynasty which is an ancient Irish sept native to north Munster. History and background First creation Under the Crown of Ireland Act 1542, K ...
, Earl of Inchiquin *= Marquess of Thomond


Notes


See also

* Irish nobility * Irish royal families * List of people named O'Brien *
Irish clans Irish clans are traditional kinship groups sharing a common surname and heritage and existing in a lineage-based society, originating prior to the 17th century. A clan (or in Irish, plural ) included the chief and his Patrilineality, patrilineal ...


References


Footnotes


Bibliography

* * * * * * * * * *


External links


The O'Brien Clan
{{DEFAULTSORT:Obrien Dynasty Septs of the Dál gCais Aibell O'Brien Gaels