The kings of Thomond 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)

Kings of Thomond

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

Ó Briain Clann Tadhg, 1276-1311

1276–1306 1306–1311

Ó Briain Clann Briain Ruadh, 1277-1284

1277–1284 (claimant)

Ó Briain Clann Briain Ruadh, 1311-1317

1311–1313 1313–1317

Ó Briain Clann Tadhg, 1317-1343

1317–1343

Ó Briain Clann Briain Ruadh, 1343-1350

1343–1350

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

Line of Kings