Roman Catholic Diocese of Kilmore - Ecclesiastical History

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 boundaries of the diocese are approximately the same as those of the ancient Kingdom of Breifne; which today consists of almost all of County Cavan, roughly the northern half of County Leitrim, and parts of County Fermanagh, County Meath and County Sligo.

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 to be 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 chieftanship 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.

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