In 1406, the annals record that the church of Forgnaidhe was burned by the family of Robert Dalton, a laconic entry that fixes the building in the turbulence of medieval Connacht-Ulster borderland politics and hints at a community left without its place of worship.

The surviving masonry, reasonably well-coursed, suggests a building of some care and permanence before that burning. The north wall runs to 14.1 metres and the east wall to 7 metres; beyond a single niche cut into the north wall, no other architectural details remain legible. The church sits on a steep south-south-east-facing slope overlooking low, wet ground, positioned to the east of a subrectangular graveyard that still surrounds it. The site was considered significant enough to be recorded on an early seventeenth-century map of Shrule barony, now held in the British Library as part of the Cotton Manuscripts, confirming that the ruins were already a landmark feature of the landscape at that point. About 320 metres to the west-north-west lies St Patrick's Well, a holy well dedicated to the patron saint of Ireland, a type of site typically associated in the early Irish church with the founding of a religious community nearby; its proximity here may point to deep roots for Christian activity at Forgney long before the medieval building now visible.