page_title: East Breifne
hierarchical_section_title: East Breifne
caption_attribution_description: Historical map of Ireland from http://www.wesleyjohnston.com/users/ireland/maps/historical/map1300.gif
context_page_description: The Kingdom of East Breifne or Breifne O'Reilly 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 and lasted until the early 17th century.
context_section_description: The Kingdom of East Breifne (Old Irish: Muintir-Maelmordha; Irish: Bréifne Uí Raghallaigh) or Breifne O'Reilly 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.
caption: A map of 1450 Ireland shows Breifne O'Reilly
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