Home» Monastic Sites» Tyrone» Glenarb Monastery Glenarb Monastery Tyrone Early Irish Early Christian Ruins About This Site Early monastic site Historical Information Alternative Names: Cluain-oirbClonarb Other Sites in Tyrone Ardboe High Cross High Cross located in Tyrone. Learn More Ardboe Monastery Early monastic site, founded late 6th century; burned 1166; destroyed by John de Courcey in 1198 Learn More Ardstraw Monastery Early monastic site, founded by St Eugene; diocesan cathedral c.581; see transferred to Maghera c.1152; erenaghs until early 17th century Learn More Ardtrea Monastery Early monastic site, nuns founded 5th century by St Trea Learn More