The see of Kilmore was originally known as Breifne (Latin: Tirbrunensis, Tybruinensis or Triburnia; Irish: Tír mBriúin, meaning "the land of the descendants of Brian", one of the kings of Connaught) and took its name after the Kingdom of Breifne.
Primate James Ussher was appointed to this church in 1607, and Edward Wetenhall, afterwards Bishop of Kilmore, author of the well-known Greek and Latin Grammars, was curate here.
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William Bedell, who succeeded Moigne as Bishop of Kilmore disputed this act of Bagshaw’s.
The Cathedral of Saint Patrick and Saint Felim in Cavan town, is the seat of the Bishop of Kilmore and the mother church of the Roman Catholic Diocese of Kilmore.