The diocese of Ossory was one of the twenty-four dioceses established at the Synod of Rathbreasail in 1111 and coincided with the ancient Kingdom of Ossory (Osraige); this is unusual, as Christian dioceses are almost always named for cities, not for regions. The episcopal see has always been in Kilkenny, the capital of Ossory at the time of the Synod of Rathbreasail. The erroneous belief that the cathedral was originally further north at Aghaboe is traced by John Bradley to a 16th-century misinterpretation of a 13th-century property transfer, combined with the fact that the abbey at the site which became St Canice's Cathedral, Kilkenny, was a daughter house of Aghaboe Abbey.[2]
List of bishops up to 1386. Note the change from Gaelic names to Norman and English names after the Norman conquest of IrelandList of bishops from 1386 onward — Catholic succession
The following list of bishops is inscribed in St Mary's Cathedral, Kilkenny and was listed on the Catholic diocese's website.[3] Bishops in the early Irish church ruled over a kingdom, in this case, Osraige or Ossory, but were also often associated with a particular monastery and may have been in some matters subordinate to its abbot.
Appointed 25 October 1395; translated to Llandaff 2 July 1398, later Bishop of Worcester (England) (1407.07.04 – 1419.03)
1398
1400
John Waltham, O.S.A. (first time)
Appointed 1 February 1398; translated to Dromore 14 May 1400
1399
1400
John Griffin
Translated from Leighlin 2 July 1399; died c. March 1400
1400
John
Appointed before 14 May 1400; died after 8 June 1400
1400
1402
Roger Appleby, O.S.A.
Appointed 26 September 1400; resigned October 1402; later Bishop of Dromore (Northern Ireland) (1402.10.11 – 1407), finally Bishop of Waterford and Lismore (Ireland) (1407 – death 1409)
1402
1405
John Waltham, O.S.A. (again)
Translated from Dromore 9 or 11 October 1402; died 5 November 1405
1405
1407
See vacant
1407
1417
Thomas Snell
Translated from Waterford and Lismore (Bishop since 1400.05.26) 11 March 1407; died 16 October 1417
1417
1421
Patrick Foxe
Translated from Cork (uncanonical Bishop since 1409.10.14) on 15 December 1417; died 20 April 1421
1421
1426
Dionysius Ó Deadhaidh
Appointed 4 July 1421; died before 12 December 1426
1427
1460
Thomas Barry
Appointed 19 February 1427; died 3 March 1460
1460
1478
David Hackett
Appointed 4 July 1460; died 24 October 1478
1479
1487
Seán Ó hÉidigheáin
Appointed 15 January and consecrated 21 February 1479; died 6 January 1487
Nominated by King Edward VI 22 October 1552; consecrated 2 February 1553; compelled to flee under Queen Mary I in September 1553; died November 1563
1553
1565
John Tonory, O.S.A.
Nominated in December 1553 by Queen Mary I and consecrated January 1554. Allegiance to the papacy was restored on 29 November 1554, but after the accession of Queen Elizabeth I his position is uncertain. He died in 1565.
During this period there were no bishops or vicars apostolic. Laurence Reneghan was vicar general of Ossory 1609–1613; followed by Luke Archer, O.Cist., who was also vicar apostolic of Leighlin and titular abbot of Holy Cross
Appointed coadjutor bishop 28 December 1871 (and Titular Bishop of Olba) and consecrated 5 March 1872; succeeded 11 August 1872; translated to Metropolitan see Sydney, Australia 14 March 1884 (till death 1911.08.16), created Cardinal-Priest of S. Susanna on 1885.07.30
Previously Auxiliary Bishop of Dublin 1979–1981 (Titular Bishop of Rotdon); appointed Bishop of Ossory 30 June 1981; retired 14 September 2007; died 10 October 2018
Nominated 7 January and consecrated 20 June 1813; became bishop of Ossory, Ferns and Leighlin when the dioceses were united on 12 July 1835; died 31 December 1841
^Bradley, John (2015). "Pulp Facts and Core Fictions; Translating a Cathedral from Aghaboe to Kilkenny". In Purcell, Emer; MacCotter, Paul; Nyhan, Julianne; Sheehan, John (eds.). Clerics, Kings and Vikings: Essays on Medieval Ireland in Honour of Donnchadh Ó Corráin. Four Courts Press. pp. 169–184. ISBN9781846822797.
^ abcdFryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1986). Handbook of British Chronology (3rd ed.). Cambridge: Cambridge University Press. ISBN0-521-56350-X.
^ abcdMoody, 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, ISBN0-19-821745-5