The O'Brien dynasty is a royal and noble house founded in the 10th century by Brian Boru of the Dál gCais or Dalcassians. After becoming King of Munster, through conquest he established himself as Ard Rí na hÉireann. Brian's descendants thus carried the name Ó Briain, 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 Ó Briains ruled in Munster, two held the High Kingship of Ireland. After the partition of Munster into Thomond and the MacCarthy Kingdom of Desmond by Tairrdelbach Ua Conchobair 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 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 under Henry VIII of the House of Tudor, becoming instead Earl of Thomond and maintaining a role in governance.
Today the head carries the title of Prince of Thomond, depending on succession sometimes Baron Inchiquin. Throughout the time that the Ó Briains ruled in medieval Ireland, the system of tanistry was used to decide succession, rather than primogeniture used by much of feudal Europe; the system in effect was a dynastic monarchy but family-elected and aristocratic, in the sense that the royal family chose the most suitable male candidate from close paternal relations—roydammna rather than the crown automatically passing to the eldest son. This sometimes led to in-family warring. Since 1542, the head of the Ó Briain house adopted primogeniture to decide succession of noble titles instead; the Ó Brian emerged as chiefs of the Dál gCais tribe from the south-west of Ireland — 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. In the Annals of the Four Masters, the father of Cormac Cas was said to be Oilioll Olum, according to tradition King of Munster and King of Leinster in the 3rd century.
Such a connection would have meant that the tribe held kinship with the Eoghanachta who had dominated Munster since the earliest times. While founder mythologies were common in antiquity and the medieval world, such a connection is regarded as fanciful and politically motivated in the context of the rise to prominence of the Dalcassians. Instead, academic histories 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 Déisi, a people whose name means vassals, were located where today is Waterford, south Tipperary and Limerick. During the 8th century, the latter was further divided into the Déisi Deiscirt and the Déisi Tuaisceart who would become the Dalcassians. Prehistoric ancestors of the Déisi Tuisceart and Dál gCais may have been a once prominent Érainn people called the Mairtine, 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 been part of Connacht but was renamed Thomond. After gaining influence over other tribes in the area such as the Corcu Mruad and Corcu Baiscinn, the Dalcassians were able to crown Cennétig mac Lorcáin as King of Thomond, he died in 951, his son Mathgamain mac Cennétig was to expand their territory further according to the Annals of Ulster. Mathgamain along with his younger brother Brian Boru began military campaigns such as the Battle of Sulcoit, against the Norse Vikings of the settlement Limerick, ruled by Ivar; the Dalcassians were successful, plundering spoils of jewels and silver, finding "soft, bright girls, booming silk-clad women and active well-formed boys". The males fit for war were executed at Saingel. 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; the crown of Munster was back in the hands of the Eoghanachta for two years until Brian Boru had avenged his brother, with the defeat and slaying of Máel Muad in the Battle of Belach Lechta.
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 Ivar and his sons took refuge in the monastery, Brian desecrated it and killed them in the sanctuary. 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.
Brennan is an Irish surname, an Anglicised form of two different Irish language surnames—Ó Braonáin and Ó Branáin. One source of the surname was the prominent clan Ua Braonáin of Uí Duach in Osraige who were a junior Dál Birn sept stemming from a younger son of Cerball mac Dúnlainge. Recent surname evaluations highlighted the geographic consistency of this lineage in the barony of Idough; the Irish surname Ó Braonáin, means "descendant of Braonán". The personal name Braonán is derived from a word which means "moisture", "drop"; the Irish surname Ó Branáin, means "descendant of Branán". The personal name Branán means "little raven". Brennan is a given name. Notable people with the surname include: Aaron Brennan, fictional character from the Australian soap opera Neighbours Ad Brennan, pitcher in Major League Baseball Alastair Brennan, British ice hockey player Alexander Murray Drennan, Scottish pathologist Allison Brennan, American writer of romantic thriller novels Amanda Brennan and community associate at Tumblr Andrew Brennan Angela Brennan, Australian painter.
Anna Teresa Brennan, Australian lawyer Anne M. Brennan, acting United States General Counsel of the Navy Arthur Brennan, Australian rules footballer Ashleigh Brennan, Australian gymnast Barbara Brennan, American author and spiritual healer Barry Brennan, Irish Gaelic footballer from County Galway Barry Brennan, Irish Gaelic footballer from County Laois Bernie Brennan, Canadian Football League player Beth Brennan, fictional character from the Australian soap opera Neighbours Brent Brennan, American college football head coach for San José State University Brian Brennan, Irish-Canadian author and historian Brian Brennan, former professional American football player Bríd Brennan, North Irish actress Bridin Brennan, Irish pop singer Biko Bradnock-Brennan, Irish-English footballer Cait Brennan, American singer Judith Tarr, American fantasy and science fiction author T. Casey Brennan, American comic book writer Cecily Brennan, Irish artist Charles Brennan, Professor of Food Science at Lincoln University, New Zealand Chris Brennan, American mixed martial artist Chrisann Brennan, American painter and writer Christine Brennan, sports columnist for the USA Today Christopher Brennan, Union Navy sailor in the American Civil War Christopher Brennan, Australian poet and scholar Ciarán Brennan, Irish singer and musician Cindy Brennan, co-owner and managing partner of Mr. B's Bistro Claire Baker, Scottish Labour Party politician Colleen Brennan, American pornographic actress Colt Brennan, American football player Conor Brennan, Northern Irish footballer Cormac Brennan, Irish rugby union player Dan Brennan, Canadian NHL player Daniel Brennan, Baron Brennan, British Labour life peer and barrister Darren Brennan, Irish hurler Dean Brennan, Irish footballer Debbie Brennan, British Paralympian athlete Denis Brennan, Roman Catholic Bishop of Ferns Don Brennan Donal Brennan, Gaelic footballer Doreen Brennan, Irish camogie player Doug Brennan, Canadian professional hockey defenceman Duncan Brannan, voice actor sometimes credited as Duncan Brennan Eddie Brennan, Irish hurling manager, sports broadcaster and former player Eddie Brennan, Gaelic footballer Edward A. Brennan, Chairman of the Board, President and CEO, of Sears, Roebuck and Co.
Eileen Brennan, American actress Ella Brennan, American restaurateur Enya Brennan, Irish singer Fanny Brennan, French-American surrealist painter Fran Brennan, Irish soccer player Frank Brennan Frederick Hazlitt Brennan, American screenwriter Fredrick Brennan, American computer programmer Garth Brennan, Australian professional rugby league football coach Gary Brennan, Manager of St. Patrick's G. A. A. Under 15's Gavin Brennan, Irish footballer Geoffrey Brennan, professor of philosophy Georgianna Brennan, American journalist Ger Brennan, Irish Gaelic footballer Gerald Brennan, Australian rules footballer Gerard Brennan and Chief Justice of the High Court of Australia Gloria Brennan, Aboriginal community leader and public servant from Western Australia Gomeo Brennan, Bahamian boxer of the 1950s,'60s and'70s Harold Brennan, Australian politician Howard Brennan, witness to the assassination of U. S. President John F. Kennedy Ian Brennan Ivy Brennan, fictional character from the British soap opera Coronation Street J. Keirn Brennan, American songwriter Jack Brennan Jacob Brennan, Australian rules footballer James Brennan Jane Brennan, Irish actress Jared Brennan, Australian rules footballer Jason Brennan, American philosopher and political scientist Jody Brennan, Irish hurler John Brennan Jon Brennan, Jersey rugby player Joseph Brennan Kathleen Brennan, American musician Katie Brennan, Australian rules footballer Keith Brennan, Australian di
O'Cleary is the surname of a learned Gaelic Irish family whose members appear in historical records dating to the mid-Medieval Period. The O'Clearys were descended from the Connachta's Uí Fiachrach kindred and had been rulers of Uí Fiachrach Aidhne, a kingdom in what is now the south of County Galway; the name of the family means son of the cleric. The family were subsequently expelled from their land by the Clan Ó Seachnasaigh. From the early 11th or 12th century, they were based in Tír Chonaill, located in modern-day County Donegal, where they served as poet-historians and secretaries to the O'Donnell dynasty of Tyrconnell, they authored the Ó Cléirigh Book of Genealogies. The clan Cleary and its branches appeared in Scotland, due to the historical connection and exchange between the two countries, much like the Campbells; the name has been Anglicised variously as O'Clery, Clark and Clarkson. Notable members of the clan included: Mac Comhaltan Ua Cleirigh, King of Uí Fiachrach Aidhne, fl. 964.
Lughaidh Ó Cléirigh Mícheál Ó Cléirigh, considered the chief author of the chronicle of medieval Irish history known as the Annals of the Four Masters. Cú Choigcríche Ó Cléirigh Keyes O'Clery Conor O'Clery Bernard Cleary, Canadian politician Beverly Cleary, American author Bill Cleary, American hockey player Brendan Cleary, Irish poet Brian P. Cleary, American humorist and author Daniel Cleary, Canadian hockey player Eilish Cleary, Irish disease specialist and Canadian public health official Gabriel Cleary, Irish engineer Ivan Cleary, rugby league footballer and coach Joe Cleary, Irish baseball player John Cleary John Peter Cleary MBE, Australian Diplomat Jon Cleary, Australian author Jon M. Cleary, American musician Jon Cleary, American musician Mark Cleary, Vice-Chancellor of the University of Bradford Michael Cleary, various including Michael Cleary, Australian politician and dual-code rugby footballer Michael J. Cleary, Irish bishop Michael Cleary, former Irish hurler for Nenagh Éire Óg and Tipperary Father Michael Cleary, Irish Roman Catholic priest Nikki Cleary, American singer Paul Cleary, Australian middle-distance runner Phil Cleary, Australian commentator Patrick Roger Cleary, founder of Cleary University Sean Cleary, Irish football player Sean Cleary, Irish rugby league footballer Thomas Cleary, author & translator William J. Cleary, American politician Austin Clarke, Irish Henry Edward Clarke and politician in Ontario, Canada Henry Joseph Clarke, Premier of Manitoba, Canada, 1874–1878 Peter Clarke, Irish tennis player Philip Clarke, Irish Republican Army member and politician Tom Clarke, executed for his part in the 1916 Rising Cleary University, a private business school Cleary Gottlieb Steen & Hamilton, an international law firm The Clery Act of United States law Clerys, an Irish department store McCleary Oxford Concise Companion to Irish Literature, Robert Walsh, 1996.
ISBN 0-19-280080-9 Mícheál Ó Cléirigh, His Associates and St Anthony's College Louvain, Nollaig Ó Muraíle, Four Courts Press, Dublin, 2007. ISBN 978-1-84682-082-3 O'Clery family pedigree at Library Ireland Ó Cléirigh ancestor search at Irish Times Clan Ó Cléirigh DNA Project at Family Tree DNA The O’Clerys: hereditary historians and poets at History Ireland