There seems to be some dispute over who founded a monastery at Drumlane, County Cavan, the two potential candidates being St Columba and Saint Máedóc of Ferns. If the former, then a religious house would have been established here in the mid-sixth century, if the latter then the date would be somewhat later. In any case, not a lot now remains to show how important this monastery had once been; at its height, Drumlane was the richest ecclesiastical establishment in this part of the country. The church is thought to be mid-12th century and in the aftermath of the Reformation continued to be used for services by the Church of Ireland until 1821 when a new church was built and this one unroofed. The adjacent truncated round tower, probably 11th century, is missing its upper section and now rises 38 feet.