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.
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The area of Cratloe is first mentioned in the Annals of the Four Masters, where it is recorded that in 376 AD, Crimthann mac Fidaig, King of Munster and High King of Ireland died in the Cratloe area from poison administered by his sister, Mongfind, who wished for her son Brión mac Echach Muigmedóin to be High King.