Holy Trinity Abbey, Medieval Premonstratensian priory in County Roscommon, Ireland
The abbey stands on Trinity Island within Lough Key, constructed from pale grey sandstone and limestone with a preserved west gable and pointed window.
Founded in 1215 by Clarus Mag Máilin, archdeacon of Elphin, the abbey received monks from Boyle Abbey in 1228 and gained abbey status by 1235.
The Annals of Loch Cé, an essential medieval manuscript recording Irish events between 1014 and 1590, was written by monks at Holy Trinity Abbey.
The archaeological site requires boat access to Trinity Island, which covers 0.9 hectares in Lough Key, with guided tours available through local operators.
A silver coin collection from Henry VIII and Elizabeth I periods was discovered during the 1991 archaeological excavation of the monastery grounds.
Location: County Roscommon
GPS coordinates: 53.98922,-8.25451
Latest update: March 6, 2025 19:30
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