The diocese of Clonfert was one of the twenty-four dioceses established at the Synod of Rathbreasail in 1111, and its boundaries were fixed at the Synod of Kells in 1152. During the Reformation, the bishops changed their allegiance back and forth between the Pope and the Crown. After the Reformation, there were parallel apostolic successions.
Elected before 7 November 1259 and received possession of temporalities after that date; died 6 January 1263; also recorded as Tomás mac Domnaill Móir Ó Cellaig
1263
1266
See vacant
1266
1295
Johannes de Alatre
Appointed before 29 September 1266 and received possession of temporalities on that date; consecrated 19 December 1266; translated to Benevento 2 October 1295
1296
1307
Robert, O.S.B.
Appointed 2 January and consecrated after 21 April 1296; received possession of temporalities 24 September 1296; acted as a suffragan bishop in the diocese of Canterbury 1296–1307; died after December 1307
Elected before 22 March 1308 and received possession of temporalities after that date; died in office
1320
1321
Robert Petit, O.F.M.
Elected 10 February and confirmed by the king 24 February 1320; consecrated c. 1320; deprived c. 1321; acted as a suffragan bishop in the dioceses of Worcester 1322 and Exeter 1324; later appointed Bishop of Annaghdown 27 October 1325; also known as Robert Le Petit
Elected 10 November 1319, but was not appointed until 6 August 1322; consecrated 20 September and received possession of temporalities 29 December 1322; died 7 April 1336
Appointed 18 July 1438 and again 25 October 1441; acted as a suffragan bishop in the dioceses of London, Diocese of Exeter, and Worcester 1443–59; died after 1459
1441
1448
John White, O.F.M.
Appointed 25 October 1441, but did not obtain possession of the see; resigned in July 1448
Appointed 8 June and consecrated 30 August 1587; also appointed an Auxiliary bishopof Sigüenza in 1589; died 1602; also known as Tadhg O'Farrell, Tadhg MacEoga and Tadeo O'Farrell
Appointed vicar apostolic by papal brief 13 October 1629, and appointed bishop 16 September 1641; translated to Tuam 11 March 1647; also recorded as John de Burgo and John Burke
Arrived in Ireland in 1647; appointed 11 March 1647 and consecrated 9 April 1648; left Ireland c. 1648 and spent the rest of his life in Hungary; died 14 July 1663
Previously bishop-designate of Killala and Kilmacduagh; appointed bishop of Clonfert 15 September 1713 and consecrated 15 April 1714; died in July 1715
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). Cambridge: Cambridge University Press. ISBN0-521-56350-X.