Formerly Precentor of Kilmacduagh; elected before 12 May 1227 and received possession of the temporalities after that date; date of death or end of episcopate unknown; also known as Odo
Formerly Abbot of Knockmoy; elected bishop before 10 August 1290 and received possession of the temporalities after that date; died before 1 March 1307; also known as Laurentius
c.1307
1325
Lucas
Elected bishop circa 1307; died 1325
1326
c.1357
Johannes
Elected before May 1326 and received possession of the temporalities on 14 May 1326; died circa 1357
Appointed 3 September and consecrated 4 November 1533; accepted royal supremacy and appointed Church of Ireland Archbishop of Tuam by King Henry VIII on 15 February 1537, but continued to hold Kilmacduagh; absolved from schism by Cardinal Pole and appointed Roman Catholic apostolic administrator of Tuam and Kilmacduagh 7 October 1555; died in office in 1572; also known as Christopher Bobkyn or Bodekin
1542
1555
Cornelius O'Dea
Appointed Roman Catholic bishop by the Holy See on 5 May 1542 in opposition to Bodkin, but was unable to get possession of the see; not known if he was ever consecrated; resigned when Bodkin was absolved in 1555
Translated from Killala; appointed 15 November 1703 and again 15 March 1707, but was not consecrated and probably acted as administrator; translated to Clonfert 15 September 1713
1713
1720
See vacant
1720
unknown
Francis de Burgo
Appointed 5 June and consecrated 1 May 1720; death date or end of episcopate unknown
1723
1732
Bernard O'Hara, O.F.M.
Appointed December 1723; died before November 1732
1732
unknown
Martin (Milo) Burke
Appointed 22 November 1732; consecrated 8 March 1733; death date or end of episcopate unknown
Appointed 22 June and consecrated 14 October 1744; also became Apostolic Administrator of Kilfenora when the two dioceses united in September 1750; died 29 May 1783
^Fryde, E. B.; Greenway, D.E.; Porter, S.; Roy, I. (1986). Handbook of British Chronology (3rd ed.). Cambridge: Cambridge University Press. pp. 361–362. ISBN0-521-56350-X.
^Moody, T. W.; Martin, F. X.; Byrne, F. J., eds. (1984). Maps, Genealogies, Lists: A Companion to Irish History, Part II. New History of Ireland: Volume XI. Oxford: Oxford University Press. pp. 330–331. ISBN0198217455.