O'Connor
also O'Conor, Ó Conchobhair, Connor
The royal house of Connacht, the last high kings of Ireland.
- Origin
- Connacht, Ireland
- Motto
- Ó Dia gach an cabhair
- Famous bearer
- Ruaidrí Ó Conchobhair (1116–1198), last high king of Ireland
- Register
- Irish family
Ranked of all time
The 10 Oldest Clans in Ireland
CoreHistoric reach
The seat of O'Connor
Seat vacantChief
No one leads the O'Connor community yet. When the movement opens, you can stand for its leadership, or help elect whoever does.
Current mission
No shared goal set yet. Once O'Connor has leadership, it sets the public focus: a restoration, a gathering, a real-world project that helps its own.
The O'Connor clan is being rebuilt. Join the waiting list for the movement today, and you help decide who leads it and what it does.
Help rebuild the O'Connor clan →Motto
Ó Dia gach an cabhair
“All help is from God”
What does the O'Connor name mean?
From Ó Conchobhair, descendant of Conchobhar. Conchobhar means 'lover of hounds' (con, hound + cobhar, desire). The principal Conchobhar of the surname was Conchobhar mac Tairdelbach (d. 1067), king of Connacht, whose grandson Tairdelbach Mór Ó Conchobhair (1088–1156) was high king of Ireland. The Connacht O'Conors of Roscommon are the line; lesser Ó Conchobhair kindreds gave rise to the O'Connors of Kerry, Offaly (Uí Failí), and Sligo.
The history of O'Connor
The Ó Conchobhair of Connacht were the last Gaelic high kings of Ireland. Tairdelbach Ó Conchobhair was high king from 1119 to 1156 and his son Ruaidrí from 1166 to 1186. Ruaidrí was the high king who failed to prevent the Anglo-Norman conquest of Leinster, Strongbow landed in 1170 against the background of Ruaidrí's quarrel with Diarmait Mac Murchadha, and he submitted to Henry II at the Treaty of Windsor in 1175. He retired to the Augustinian abbey at Cong in Mayo and died there in 1198. He is buried at Clonmacnoise.
The senior O'Conor Don line continued to rule a much-reduced kingdom of Connacht under Norman supervision until the Cromwellian confiscations of 1652. The current O'Conor Don, Desmond O'Conor (b. 1938), is the of three recognised O'Conor cadet branches and the only Gaelic dynastic head whose title is acknowledged in continuous male-line descent from a high king of Ireland.
Sandra Day O'Connor (1930–2023), the first woman appointed to the United States Supreme Court, descended from a Texas-O'Connor line of Famine-era Irish emigration. Sinéad O'Connor (1966–2023), the singer; Carroll O'Connor (1924–2001), the American actor; Frank O'Connor (1903–1966), the Cork short-story writer, all from the same Connacht-O'Connor surname pool. Roscommon today is still the densest O'Connor county on the island.
Champions of the O'Connor name
The bearers whose lives are inseparable from this surname. Each has their own page, biography, achievements, geography, connection to the family.
Historic Places, Rebuilt
Explore the streets and seats the O'Connor name knew, rebuilt with AI as they stood in history.
Castles the O'Connor held
Strongholds this name held for a decade or more, look one up, or rebuild it to explore.
- Ballymote Castle
Held by the O'Connor Sligo from about 1571, surrendered and regranted.
- Dough Castle
Established by the O'Connors, lords of Corcomroe, in 1306 as their principal stronghold.
- Sligo Castle
The O'Conors Sligo held the rebuilt castle in the 1530s, generally in subjection to the O'Donnells.
The castles of the homeland
The great strongholds of the homeland, look one up, see what it looked like in its prime, and recreate it to explore.
All castles in Ireland → · Strongest castles in Ireland → · Castles of Europe
Play As Your Clan
Pick any year from 500 to 1945 and any place on earth, the O'Connor country, or a shore no O'Connor ever reached. The chronicler sets the scene; the deeds are yours.
Notable bearers of the O'Connor name
- Ruaidrí Ó Conchobhair (1116–1198), last high king of Ireland
- Tairdelbach Mór Ó Conchobhair (1088–1156), high king, builder of churches at Tuam and Clonfert
- Sandra Day O'Connor (1930–2023), first woman justice of the US Supreme Court
- Sinéad O'Connor (1966–2023), singer
- Rory O'Connor (1883–1922), anti-Treaty IRA Director of Engineering, executed 1922