Diocese no longer extant, or united with another diocese.

c. 558

Cathfuidh

1152

Mael Ruanaid ua Ruadain

1159

Gille na Naehm O Ruadain [Gelasius]

1208

Clemens O Sniadaig

1220

Connmach O Torpaig [Carus]

1226

Gilla Isu O Cleirig [Gelasius]

1237

Tomas O Ruadhan

1238

Oengus O Clumain [Elias]

1251

Tomas O Maicin

1266

Tomas O Miadachain [Dionysus]

1286

Benedict O Bracain

1312

David of Kilheny

1348

David II

1348

Nicol Alias Muircheartach O hEadhra

1374

William Andrew

1385

Simon

c. 1390

Tomas mac Muirgheasa MacDonn-chadha

1401

Brian mac Seaain O hEadhra

1410

Maghnus O h Eadhra

1424

Donatus

1424

Richard Belmer

1436

Tadhg O Dalaigh

1442

James Blakedon

1449

Cornelius O Mochain

1463

Brian O hEasdhra [Benedictus]

1470

Nicholas Forden

1475

Robert Wellys

1484

Thomas fitzRichard

1484

Tomas O Conghalain

1489

John Bustamente

1492

Thomas Ford

1508

Eugenius O Flannagain

1522

Cormac O Snighe

1547

Thomas O Fihilly

1562

Eugene O'Harte

1613

Miler Magrath (with Cashel)

United to Killala 1622