List of monarchs of Thomond

The kings of Thomond ( Rí Tuamhain) 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 Munster, so had to partition the realm between themselves and Desmond, ruled by their rivals the Eóganachta. The Kings of Thomond were drawn from the leading kindred of the Dál gCais known as the Ó Briain. For centuries they fought off challenges from the Normans, including the de Clare family and internal conflict between factions. Eventually Murchadh Carrach Ó Briain decided to surrender and regrant his realm to the Kingdom of Ireland in 1543 and accepted the titles Baron Inchiquin and Earl of Thomond. These titles were recently held by Conor Myles John O'Brien (d.2023)

Ó Briain, 1118-1277
1118–1142 1142–1167 1167–1168 1168–1194 1194–1198 1203–1210 1198–1203 1210–1242 1242–1268 1268–1276 1277
 * Conchobhar Ó Briain
 * Conchobhar Ó Briain
 * Sword of Nuada.png || Son of Diarmuid Ó Briain ||unknown || 1142
 * Toirdhealbhach mac Diarmada Ua Briain
 * Toirdhealbhach mac Diarmada Ua Briain
 * Sword of Nuada.png || Son of Diarmuid Ó Briain ||unknown || 1167
 * Muircheartach mac Toirdelbhach Ó Briain
 * Muircheartach mac Toirdelbhach Ó Briain
 * Sword of Nuada.png || Son of Toirdelbhach mac Diarmaida Ó Briain ||unknown || 1168
 * Domhnall Mór Ó Briain
 * Domhnall Mór Ó Briain
 * Sword of Nuada.png || Son of Toirdelbhach mac Diarmaida Ó Briain ||Orlacan Ní Murchada Four children|| 1194
 * Muircheartach Dall Ó Briain
 * Muircheartach Dall Ó Briain
 * Sword of Nuada.png || Son of Domhnall Mór Ó Briain and Orlacan Ní Murchada||unknown|| 1210
 * Conchobhar Ruadh Ó Briain
 * Conchobhar Ruadh Ó Briain
 * Sword of Nuada.png || Son of Domhnall Mór Ó Briain and Orlacan Ní Murchada||unknown|| 1203
 * Donnchadh Cairbreach Ó Briain
 * Donnchadh Cairbreach Ó Briain
 * Sword of Nuada.png || Son of Domhnall Mór Ó Briain and Orlacan Ní Murchada||unknown|| 1242
 * Conchobhar na Suidaine Ó Briain
 * Conchobhar na Suidaine Ó Briain
 * Conor_Ruadh_O%27Brien_Tomb_Effigy_Drawing.png || Son of Donnchadh Cairbreach Ó Briain||unknown|| 1268
 * Brian Ruadh Ó Briain
 * Brian Ruadh Ó Briain
 * Sword of Nuada.png || Son of Conchobhar na Suidaine Ó Briain||unknown|| 1277
 * }
 * }

Ó Briain Clann Tadhg, 1276-1311
1276–1306 1306–1311
 * Toirdhealbhach Mór Ó Briain
 * Toirdhealbhach Mór Ó Briain
 * Toirdhealbhach_Mor_Ua_Briain.jpg || Son of Tadhg Cael Uisce Ó Briain ||unknown || 1306
 * Donnchadh mac Toirdelbach Ó Briain
 * Donnchadh mac Toirdelbach Ó Briain
 * Sword of Nuada.png || Son of Toirdelbach Ó Briain ||unknown || 1311
 * }
 * }

Ó Briain Clann Briain Ruadh, 1277-1284
1277–1284 (claimant)
 * Donnchadh mac Brian Ruadh Ó Briain
 * Donnchadh mac Brian Ruadh Ó Briain
 * Sword of Nuada.png || Son of Brian Ruadh Ó Briain ||unknown || 1284
 * }
 * }

Ó Briain Clann Briain Ruadh, 1311-1317
1311–1313 1313–1317
 * Diarmuid Cléirech Ó Briain
 * Diarmuid Cléirech Ó Briain
 * Sword of Nuada.png || Son of Donnchadh mac Brian Ruadh Ó Briain ||unknown || 1313
 * Donnchadh mac Domhnall Ó Briain
 * Donnchadh mac Domhnall Ó Briain
 * Sword of Nuada.png || Son of Domhnall mac Brian Ruadh Ó Briain and Mairéad Nic Mathghamhna||unknown || 1317
 * }
 * }

Ó Briain Clann Tadhg, 1317-1343
1317–1343
 * Muircheartach Ó Briain
 * Muircheartach Ó Briain
 * Sword of Nuada.png || Son of Toirdhealbhach Mór Ó Briain||Éadaoin Nic Gormáin Several children || 1343
 * }
 * }

Ó Briain Clann Briain Ruadh, 1343-1350
1343–1350
 * Brian Bán Ó Briain
 * Brian Bán Ó Briain
 * Sword of Nuada.png || Son of Domhnall mac Brian Ruadh Ó Briain and Mairéad Nic Mathghamhna||unknown || 1350
 * }
 * }

Ó Briain Clann Tadhg, 1350-1543
1350–1360 1360–1369 1369–1400 1375–1398 (claimant) || || Son of Muircheartach Ó Briain and Éadaoin Nic Gormáin||unknown || 1398 1400–1426 1426–1438 1438–1444 1444–1459 1459–1466 1459–1461 (claimant) || || Son of Mathghamhain Dall Ó Briain||unknown || 1461 1466–1496 1496–1498 1498–1528 1528–1539 1539–1543
 * Diarmuid mac Toirdelbach Ó Briain
 * Diarmuid mac Toirdelbach Ó Briain
 * Sword of Nuada.png || Son of Toirdelbach Ó Briain||unknown || 1360
 * Mathghamhain Maonmhaighe Ó Briain
 * Mathghamhain Maonmhaighe Ó Briain
 * Sword of Nuada.png || Son of Muircheartach Ó Briain and Éadaoin Nic Gormáin||Úna Ní Conchubhair Several children|| 1369
 * Brian Sreamhach Ó Briain
 * Brian Sreamhach Ó Briain
 * Sword of Nuada.png || Son of Mathghamhain Maonmhaighe Ó Briain and Úna Ní Conchubhair||Sláine Nic Con Mara Several children || 1400
 * Toirdelbhach Maol Ó Briain
 * Toirdelbhach Maol Ó Briain
 * Conchobhar mac Mathghamhna Ó Briain
 * Conchobhar mac Mathghamhna Ó Briain
 * Sword of Nuada.png || Son of Mathghamhain Maonmhaighe Ó Briain and Úna Ní Conchubhair||unknown || 1426
 * Tadhg an Glemore Ó Briain
 * Tadhg an Glemore Ó Briain
 * Sword of Nuada.png || Son of Brian Sreamhach Ó Briain and Sláine Nic Con Mara||unknown || 1438
 * Mathghamhain Dall Ó Briain
 * Mathghamhain Dall Ó Briain
 * Sword of Nuada.png || Son of Brian Sreamhach Ó Briain and Sláine Nic Con Mara||unknown || 1444
 * Toirdhealbhach Bóg Ó Briain
 * Toirdhealbhach Bóg Ó Briain
 * Sword of Nuada.png || Son of Brian Sreamhach Ó Briain and Sláine Nic Con Mara||Catherine Burke Several children || 1459
 * Tadhg an Chomhaid Ó Briain
 * Tadhg an Chomhaid Ó Briain
 * Sword of Nuada.png || Son of Toirdhealbhach Bóg Ó Briain and Catherine Burke||Annabella Burke Several children || 1466
 * Donnchadh mac Mathghamhna Ó Briain
 * Donnchadh mac Mathghamhna Ó Briain
 * Conchobhar na Srona Ó Briain
 * Conchobhar na Srona Ó Briain
 * Sword of Nuada.png || Son of Toirdhealbhach Bóg Ó Briain||unknown || 1496
 * Toirdelbhach Óg Ó Briain
 * Toirdelbhach Óg Ó Briain
 * Sword of Nuada.png || Son of Toirdhealbhach Bóg Ó Briain and Catherine Burke||unknown || 1498
 * Toirdhealbhach Donn Ó Briain
 * Toirdhealbhach Donn Ó Briain
 * Sword of Nuada.png || Son of Tadhg an Chomhaid Ó Briain and Annabella Burke||Raghnailt Nic Con Mara Several children Joan FitzMaurice Several children || 1528
 * Conchobhar mac Toirdhealbaig Ó Briain
 * Conchobhar mac Toirdhealbaig Ó Briain
 * Sword of Nuada.png || Son of Toirdelbhach Donn Ó Briain and Raghnailt Mac Con Mara||unknown || 1539
 * Murchadh Carrach Ó Briain
 * Murchadh Carrach Ó Briain
 * Sword of Nuada.png || Son of Toirdelbhach Donn Ó Briain and Raghnait MacNamara||Eleanor FitzGerald || 1551
 * }
 * }