House of O'Brien
- Coat of Arms
-
House of O'Brien
Dál gCais
Kings and Princes of Thomond
Ancient arms -
House of O'Brien
Arms awarded in 1543 after submission to Henry VIII of England -
House of O'Brien
Barons Ibrickane
Earls of Thomond
- Dál gCais Branches
-
House of O'Grady
Lords of Cinel Dunghaile and Kilballyowen
Viscounts Guillamore -
House of O'Kennedy
Lords of Ormond
High Chiefs of Ormond Upper and Ormond Lower -
House of MacMahon
Lords of Corcabaskin
Marquises of Eguilly
Dukes of Magenta
- Cadet Branches
-
House O'Brien of Inchiquin
Barons Inchiquin and Thomond
Barons O'Brien of Burren
Earls of Inchiquin
Marquesses of Thomond
Chiefs of O'Brien
Issued from Murrough O'Brien, 1st Earl of Thomond and 1st Baron Inchiquin, younger son of Turlough O'Brien, King of Thomond -
House O'Brien of Leaghmenagh
Lords of Leamaneh Castle and Dromoland Castle
Baronets of Leaghmenagh
Barons Inchiquin
Issued from Donough O'Brien, younger son of Murrough O'Brien, 1st Earl of Thomond and 1st Baron Inchiquin -
House O'Brien of Clare
Barons Moyarta
Viscounts Clare
Titular Earls of Thomond
Issued from Daniel O'Brien, younger son of Connor O'Brien, 3rd Earl of Thomond
Used undifferentiated arms of the family
- Personal Arms
-
Turlogh O'Brien
Lord of Ibrickane
Son of Connor O'Brien, King of Thomond from his 2nd marriage
Uncle of Donough O'Brien, 2nd Earl of Thomond
