The Kings of Connacht were rulers of the cóiced (variously translated as portion, fifth, province) of Connacht, which lies west of the River Shannon, Ireland. However, the name only became applied to it in the early medieval era, being named after the Connachta. The old name for the province was Cóiced Ol nEchmacht (the fifth of the Ol nEchmacht). Ptolemy's map of c. 150 AD does in fact list a people called the Nagnatae as living in the west of Ireland. Some are of the opinion that Ptolemy's Map of Ireland may be based on cartography carried out as much as five hundred years before his time. The Connachta were a group of dynasties who claimed descent from the three eldest sons of Eochaid Mugmedon: Brion, Ailill and Fiachrae. They took their collective name from their alleged descent from Conn Cétchathach. Their younger brother, Niall Noigiallach was ancestor to the Uí Néill. The following is a list of kings of Connacht from the fifth to fifteenth centuries.

Prehistoric kings of Ol nEchmacht

List of historical kings

Uí Fiachrach, 406–482

Uí Briúin, 482–500

Uí Fiachrach, 500–549

Uí Briúin, 549–600

Uí Fiachrach Aidhne, 600–622

Uí Briúin, 622–649

Uí Fiachrach Aidhne, 649–663

Uí Briúin Seóla, 663–682

Uí Fiachrach Muaidhe, 682–683

Uí Fiachrach Aidhne, 683–696

Uí Briúin Síl Muiredaig, 696–702

Uí Briúin Síl Cellaig, 702–705

Uí Fiachrach Muaidhe, 705–707

Uí Briúin Síl Muiredaig, 707–723

Uí Briúin Síl Cellaig, 723–728

Uí Briúin Síl Cathail, 728–735

Uí Briúin Síl Muiredaig, 735–742

Uí Briúin Síl Cellaig, 742–756

Uí Fiachrach Muaidhe, 756–764

Uí Briúin Síl Cathail, 764–768

Uí Fiachrach Muaidhe, 768–773

Uí Briúin Síl Cellaig, 773–777

Uí Briúin Síl Cathail, 777–782

Uí Briúin Síl Muiredaig, 782–786

Uí Briúin Síl Cathail, 786–792

Uí Briúin Síl Cellaig, 792–796

Uí Briúin Síl Muiredaig, 796–839

Uí Briúin Síl Cathail, 839–843

Uí Briúin Síl Muiredaig, 843–848

Uí Briúin Síl Cathail, 848–872

Uí Briúin Síl Muiredaig, 872–956

Ó Ruairc, 956–967

Ó Conchobhair, 967–1030

Ó Ruairc, 1030–1046

Ó Conchobhair, 1046–1067

Ó Ruairc, 1067–1087

Ó Conchobhair, 1087–1092

Ó Flaithbheartaigh, 1092–1095

Ó Conchobhair, 1092–1097

Ó Ruairc, 1097–1102

Ó Conchobhair, 1102–1280

Muircheartaigh Uí Conchobhair, 1280–1293

Ó Conchobhair, 1293–1309

Muircheartaigh Uí Conchobhair, 1309–1310

Ó Conchubhair Ruadh, 1310–1317

Ó Conchobhair, 1316–1317

Ó Conchubhair Donn, 1317–1350

Ó Conchobhair Sligigh, 1318–1324

Muircheartaigh Uí Conchobhair, 1342–1350

Ó Conchubhair Donn, 1368–1474

Sources