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|Parent house||Uí Briúin Ai / Síl Muiredaig|
|Founder||Conchobar mac Taidg Mór|
|Final ruler||Fedlim Geancach Ó Conchobair|
|Current head||Desmond O'Conor Don|
O'Conor (Middle Irish: Ó Conchubhair; Modern Irish: Ó Conchúir), is an Irish Gaelic Aristocratic catholic Family who are the historic Kings of Connacht and the last High Kings of Ireland before the Norman invasion. The family seat is Clonalis House outside Castlerea in County Roscommon. The O'Conor family can trace their lineage back to the 5th century without dispute but through folklore and mythology to Adam. The clan name originated in the 10th century as a derivative of its founder Conchobar mac Taidg Mór. The family contributed to Irish society in art, history, language, politics, diplomacy, etc... before and during colonial rule in Ireland.They descend in the paternal line from the Connachta's Uí Briúin Ai. The current O'Conor Don is Desmond O'Conor Don (b. 22 September 1938) who lives in Rotherfield, East Sussex in England.
The Ó Conchubhair Donn is the senior head of a lineage which provided about one hundred Kings of Connacht, thirty Chief of the Name and eleven High Kings of Ireland, the last of them being Tairrdelbach Ua Conchobair (1088–1156), and his son Ruaidrí Ua Conchobair (c. 1115–1198).
During the late 14th century, the Ó Conchubhair dynasty grouped into two main divisions, one led by Toirdealbhach Ruadh, the other by Toirdealbhach Óg (also called Toirdealbhach Donn), both in the seventh generation of descent from Cathal Crobhderg. From these descended the families of Ó Conchubhair Ruadh and Ó Conchubhair Donn, the former died out.
The great Irish scholar John O'Donavan once said of the O'Conor's.... "No family in Ireland claims greater antiquity and no family in Europe, royal or noble, can trace its descent through so many generations of legitimate ancestors."[full citation needed]
O'Conor Nash of Clonalis
On the death in 1981 of Rev. Charles O'Conor Don SJ, Clonalis House, the ancestral seat of the O'Conor Don Family, passed to his sister Gertrude O'Conor Nash. Consequently, not for the first time, the family title and family seat were separated, remaining within a more direct O'Conor family lineage.
The O'Conor Nash family now reside at Clonalis House where they maintain the O'Conor archives.
Chiefs of the Name
- Toirdhealbhach Óg Donn mac Aodha meic Toirdhealbhaigh, d. 9 December 1406.
- Cathal mac Ruaidhri Ó Conchobhair Donn, d. 19 March 1439.
- Aodh mac Toirdhealbhaigh Óig Ó Conchobhair Donn, d.15 May 1461.
- Feidhlimidh Geangcach mac Toirdhealbhaigh Óig Ó Conchobhair Donn, d. 1474 – last fully recognised King of Connacht.
- Tadhg mac Eoghain Ó Conchobhair Donn, d. 1476.
- Eoghan Caoch mac Feidhlimidh Gheangcaigh Ó Conchobhair Donn, d. 1485.
- Aodh Og mac Aodh Ó Conchobhair Donn, died ?
- Toirdhealbhach Óg mac Ruaidhri Ó Conchobhair Donn, d. 1503
- Conchobhar mac Eoghain Chaoich Ó Conchobhair Donn, d.?
- Cairbre mac Eoghain Chaoich Ó Conchobhair Donn, d. 1546
- Aodh mac Eoghain Chaoich Ó Conchobhair Donn, deposed 1550
- Diarmaid mac Cairbre Ó Conchobhair Donn, d. 1585
- Sir Hugh/Aedh Ó Conchobhair Donn, d. 1632
- An Calbhach mac Aedh Ó Conchobhair Donn, d. 1654 – popularly inaugurated king in 1643.
- Hugh Óg mac Aedh Ó Conchobhair Donn, d. 1662.
- Major Owen O'Conor Don of Belangare, d.s.p.m. 1692
- Cathal Óg O'Conor Don of Belangare, d. 1696
- Denis O'Conor Don, 1674–1750
- Charles O'Conor Don, 1710–1791
- Denis O'Conor Don of Belangare, 1732–1804
- Owen O'Conor Don of Clonalis, 1763–1831
- Matthew O'Conor Don, 1773–1844 – popularly acclaimed 'king' in the 1830s.
- Denis O'Conor Don of Clonalis, 1794–1847
- Charles Owen O'Conor Don, 1838–1906
- Charles O'Conor Don, 1869–1917
- Owen Phelim O'Conor Don, 1870–1943
- Fr. Charles O'Conor Don, 1906–1981
- Denis O'Conor Don, 1912 – 10 July 2000
- Desmond O'Conor Don (Chairman of the British-Chile Chamber of Commerce, former banker, resides in Sussex)
Known Members of the O'Conor Don Family
Kings of Connacht
- Conchobar mac Taidg Mór 872–882
- Áed mac Conchobair 882–888
- Tadg mac Conchobair 888–900
- Cathal mac Conchobair 900–925
- Tadg mac Cathail 925–956
- Conchobar mac Tadg 967–973
- Cathal mac Tadg d. 973
- Cathal mac Conchobar mac Taidg 973–1010
- Ruaidrí na Saide Buide 1087–1092
- Tadg mac Ruaidrí Ua Conchobair d. 1097
- Domnall Ua Conchobair 1102–1106
- Tairrdelbach Ua Conchobair 1106–1156
- Ruaidrí Ua Conchobair 1156–1186
- Conchobar Máenmaige Ua Conchobhair 1186–1189
- Cathal Carragh Ua Conchobhair 1190–1202
- Cathal Crobderg Ua Conchobair 1202–1224
- Aedh Ua Conchobair 1224–1228
- Aedh mac Ruaidri Ua Conchobair 1228–1233
- Felim mac Cathal Crobderg Ua Conchobair 1233–1256
- Aedh Ó Conchobair 1256–1274
- Aedh Muimhnech Ó Conchobair 1274–1280
- Maghnus Ó Conchobair 1288–1293
- Aedh Ó Conchobair 1293–1309
- Ruaidri Ó Conchobair 1309–1310
- Fedlim Ó Conchobair 1310–1316
- Rory na-bhFeadh Ó Conchobair 1316–1317
- Toirdelbach Ó Conchobair first reign 1317–1318 second reign, 1324–1350
- Cathal mac Domhnall Ó Conchobair 1318–1324
- Aedh mac Aedh Breifneach Ó Conchobair 1342; died 1350
- Aedh mac Tairdelbach Ó Conchobair
- Ruaidri mac Tairdelbach Ó Conchobair 1368–1384
- Hugo Oconór (Spanish Army Officer)
- Thomas O'Connor (Writer)
- Charles O'Conor (Irish American Lawyer and Politician)
- Nicholas Roderick O'Conor (British Diplomat)
- Roderic O'Conor (Artist)
- Charles O'Conor (historian) (Historian)
- Charles O'Conor (priest) (Priest and Historical author)
- Matthew O'Conor (Historian)
- Denis O'Conor (Politician)
- Charles Owen O'Conor (Politician)
- Denis Maurice O'Conor (Politician)
- Denis O'Conor Don (Prior Holder of Chief of Name O'Conor, died 10 July 2000)
- Ó Conchobhair Sligigh
- Clan Muircheartaigh Uí Conchobhair
- Gaelic nobility of Ireland
- Chief of the Name
- Irish nobility
- Irish Royal Families
- Chief Herald of Ireland
- Curley, W. Vanishing Kingdoms. Dublin. Lilliput Press.
- O'Connor, Roderic, A Historical and Genealogical Memoir of the O'Connors, Kings of Connaught, and their Descendants. Dublin: McGlashan & Gill. 1861.
- O'Donovan, John and the Rt. Hon. Charles Owen O'Conor Don, The O'Conors of Connaught: An Historical Memoir. Dublin: Hodges, Figgis, and Co. 1891.