Dartraighe (older spelling: Dartraige), anglicised as Dartree, Dartry or Dartrey, was an Irish territory or tuath in medieval Ireland which stretched north to Clones and south to the Dromore River.
The Dartraighe were an Irish túath, also known as n-Dartraighi or Dairtre who gave their name to a territory in the western portion of what is now known as County Monaghan.
Dartraighe was listed as part of the federated Kingdom of Airgíalla in the Book of Rights, and included there in a poem credited to Benén, son of Sescnén, Patrick's cantor, though in its surviving form the composition can be dated to between 901 and 908 AD:[2] The king of Dartraige, a flame of valour, is entitled to four bondsmen of great labor, four swords hard in battle, four horses,
and four golden shields.There are references in Irish annals in the 11th and 12th centuries to the Ui Bhaoigheallán (O'Boylans) as lords (tigherna) of Dartraige (see below).
In 1297 the sub-chiefs of the Airgíalla included the lord of Dartraighe, named as the king's brother Roalbh Mac Mathghamhna.