1152-1173
Muiredhach Ó Cofaigh

1173-1184
Amhlaí Ó Muireadhaigh

1185-1230
Fógartach Ó Cearbhalláin I

1230-1279
Giolla an Choimde Ó Cearbhalláin

1280-1293
Fógartach Ó Cearbhalláin II

1295-1297
Enri Mac Airechtaig

1297-1315
Gofraidh Mac Lochlainn

1316-1319
Aodh Ó Néill

1319-1349
Micheál Mac Lochlainn

1349-1380
Simon

1391-1394
John Dongan

1394
Eoin Ó Mocháin
(does not appear to have taken possession of the diocese)

1398-1401
Aodh

1401-1415
Seán Ó Flannabhra

1415
Domhnall Mac Cathmaoil
(not consecrated as bishop)

1419-1429
Domhnall Ó Meraigh

1429-1433
Eoghan Ó Domhnaill

1433-1455
Sean Ó Gubúin

1458-1463
Bartholomew Ó Flanagáin

1464-1466
John (Seán)

1466-1484
Nicolas Weston

1487-1500
Domhnall Ó Fallúin

1503-1519
Séamus Mac Mathúna

1520-1550
Ruairí Ó Domhnaill

1554-1569
Eoghan Ó Dochartaigh

1569-1601
Réamonn Ó Gallachair

1601-1720
See was vacant and ruled by vicars apostolic

1720-1727
Terence O’Donnelly

1727-1738
Neal Conway

1739-1749
Michael O’Reilly

1749
John Ó Brolcháin
(not consecrated)

1751-1752
Patrick Ó Brolcháin

1752-1765
John McColgan

1766-1797
Philip McDevitt

1798-1823
Charles O’Donnell

1824-1840
Peter McLaughlin

1840-1845
John McLaughlin

1846-1849
Edward Maginn
(Coadjutor bishop)

1849-1864
Francis Kelly
(Coadjutor bishop)

1864-1889
Francis Kelly
(bishop)

1890-1907
John Keys O’Doherty

1907-1926
Charles McHugh

1926-1939
Bernard O’Kane

1939-1973
Neil Farren

1974-1993
Edward Daly

1988-
Francis Lagan

1994-
Séamus Hegarty

Top Left Image : The Bishop's Chair
Top Right Image : Stained Glass Window at the front of the Cathedral