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This ruined medieval priory stands on the northern outskirts of Louth Village. It stands on the site of Celtic monastery established by St Mochta in the early sixth century. In the 1130s the Augustinians established an abbey here and during the following century it was burnt down no fewer than four times. The present ruins are those the abbey built after the fire of 1166. The monastery was dissolved in the 16thC with the monastic lands passing to the hands of Lord Louth, a scion of the Plunket family, of which the later Catholic martyr St. Oliver Plunket was a member.