The Kingdom of East Breifne or Breifne O'Reilly (Old Irish: Muintir-Maelmordha; Irish: Bréifne Uí Raghallaigh, IPA: [ˈbʲɾʲeːfʲnʲə iː ˈɾˠəil̪ˠiː]) was an historic kingdom of Ireland roughly corresponding to County Cavan that existed from 1256 to 1607. It took its present boundaries in 1579 when East Breifne was renamed Cavan, after Cavan town, and shired into Ulster. Originally part of the older Kingdom of Breifne, East Breifne came into existence following a protracted war between the ruling O'Rourke clan and the ascendant O'Reillys which culminated in the division of the kingdom in 1256. The Kingdom was ruled by the dynasty of the Ó Raghallaigh (O'Reilly) and lasted until the early 17th century.
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⭐ Core Definition: East Breifne
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East Breifne in the context of County Cavan
County Cavan (/ˈkævən/ KAV-ən; Irish: Contae an Chabháin) is a county in Ireland. It is in the province of Ulster and is part of the Northern and Western Region. It is named after the town of Cavan and is based on the historic Gaelic territory of East Breffny (Bréifne). Cavan County Council is the local authority for the county, which had a population of 81,704 at the 2022 census.
View the full Wikipedia page for County Cavan