Roman Catholic Diocese of Kilmore

The Diocese of Kilmore (Dioecesis Kilmorensis; Deoise na Cille Móire) is a Latin Church diocese which is mainly in the Republic of Ireland although a few parishes are in Northern Ireland. It is one of eight suffragan dioceses which are subject to the Metropolitan Archdiocese of Armagh.

On 29 June 2020, it was announced that Pope Francis had appointed Martin Hayes, a former priest of the Archdiocese of Cashel and Emly, as Bishop of Kilmore in succession to Philip Leo O'Reilly. He received episcopal ordination on 20 September 2020.

Geography
Kilmore diocese covers most of County Cavan and parts of counties Leitrim, Fermanagh, Meath and Sligo. The main towns are Bailieborough, Ballyjamesduff, Cavan, Manorhamilton and Virginia.

Ecclesiastical history
The diocese of Kilmore was originally called Breifne (Latin: Tirbrunensis, Tybruinensis or Triburnia; Irish: Tír mBriúin, meaning "the land of the descendants of Brian", one of the Uí Briúin kings of Connacht). It was formally established as one of the dioceses approved by Cardinal Giovanni Paparoni at the synod of Kells in 1152. The 'Bishop of the Uí Briuin' used the style Bishop of Kells. The boundaries of the diocese were approximately the same as those of the ancient Kingdom of Breifne as held under Tigernán Ua Ruairc; which today would consist of almost all of County Cavan, roughly the northern half of County Leitrim, and parts of County Fermanagh, County Meath and County Sligo. The boundaries were modified under the Norman colony with parts of Meath, including the town of Kells, being absorbed into the diocese of Meath.

In 1454, Bishop Aindrias Mac Brádaigh (Andrew McBrady) was given permission by Pope Nicholas V to have the ancient church at Kilmore, founded in the sixth century by Saint Felim, to be the cathedral church of the diocese. It was rebuilt and became known in Irish as An Chill Mhór (meaning Great Church) and anglicised as Kilmore, which gave its name to the diocese, a name which has remained ever since.

Tir Brun / Kilmore was a territorial diocese, based on the kingdom of Breifne. From the late twelfth century the chieftainship of Breifne was contested between the Ui Raghallaigh or O'Reilly sept in the east and the Ui Ruairc or O'Rourke sept in the west. The bishops of the diocese came predominantly from the eastern end of the diocese, right down until the reformation.

Kingdom of Ireland
During the Reformation in Ireland, the diocese lost the cathedral and all other temporalities. After a period of two hundred years of uncertainty, Bishop Denis Maguire (1770–98) gave new stability to the diocese and started the process of rebuilding both discipline and churches. Bishop James Browne (1827–65) continued with this work and founded the diocesan college in 1839. Patrick Lyons (bishop of Kilmore) (1937–49) had the old Roman Catholic Cathedral in Cavan rebuilt between 1938 and 1942. The current cathedral is dedicated to Saints Patrick and Felim and is built in the neoclassical style with a spire of 230 ft.

Ordinaries
The following is a basic list of the bishops of Kilmore since 1728.
 * Michael MacDonagh, O.P. (1728–1746)
 * Laurence Richardson, O.P. (1747–1753)
 * Andrew Campbell (1753–1769)
 * Denis Maguire, O.F.M. (1770–1798)
 * Charles O'Reilly (1798–1800)
 * James Dillon (1800–1806)
 * Farrell O'Reilly (1807–1829)
 * James Browne (1829–1865)
 * Nicholas Conaty (1865–1886)
 * Bernard Finegan (1886–1887)
 * Edward MacGennis (1888–1906)
 * Andrew Boylan, C.SS.R. (1907–1910)
 * Patrick Finegan (1910–1937)
 * Patrick Lyons (bishop of Kilmore) (1937–1949)
 * Austin Quinn (1950–1972)
 * Francis Joseph MacKiernan (1972–1998)
 * Philip Leo O'Reilly (1998–2018)
 * Martin Hayes (2020–present)

Kilmore Diocesan Pastoral Centre
The Kilmore Diocesan Pastoral Centre was created in 2005, in the old boarding school wing of St. Patrick's College, Cavan. It was officially opened on 13 February 2005 by Cardinal Seán Brady. A range of ministry and faith development activities are provided. The Faith formation and the Catechism course which is accredited by the Mater Dei Institute of Education and the Maryvale Institute has been provided from the centre.