Home» Monastic Sites» Mayo» Annagh, Costello Annagh, Costello Mayo Augustinian Medieval Uncertain About This Site Augustinian Canons Regular supposed cell dependent on Cong; possible confusion with Annagh, Kilmaine Other Sites in Mayo Aghagower Abbey Early monastic site, Patrician monks founded in the 5th century by St Patrick; Augustinian Canons Regular Learn More Aghamore Monastery Early monastic site, founded by St Patrick for Loam Learn More Airne Monastery Early monastic site, probably founded in the 5th century, in the time of St Patrick Learn More An Caiseal Holy Well The Archaeological Survey of Ireland (ASI) is in the process of providing information on all monuments on The Historic Environment… Learn More