Home» Monastic Sites» Waterford» Achad-crimthain Monastery Achad-crimthain Monastery Waterford Early Irish 9th Century Ruins About This Site Early monastic site, founded before 829; possibly located in County Waterford Historical Information Founded:before 829 Other Sites in Waterford (Site of) All Saints Well Marked similarly on the 1840 and 1926 eds of the OS 6-inch map, and situated on a level landscape with… Learn More Achad-dagain Monastery Early monastic site, founded before 639 Learn More Ardmore Cathedral Early monastic site, Gaelic monks, founded in the 5th century by St Declan; diocesan cathedral 1152; see united with Lismore… Learn More Ardmore Friary Augustinian Friars Learn More