At Archerstown in County Westmeath, the carved stone head, which would once have crowned a decorative three-lobed window, now rests on the stub of the south wall, displaced and exposed to the sky. The chapel it belonged to has been reduced to grass-covered footings on three sides, with only the west wall still standing to any appreciable height, reaching about one and a half metres at its best. Embedded into the inner face of that wall are nineteenth-century headstones and a cast iron memorial railing belonging to the Monahan family, so that the boundary between graveyard and ruin has effectively dissolved.

The building was a chapel of ease, a secondary place of worship built to spare parishioners a long journey to their main parish church, and it appears on the Down Survey maps of 1655 to 1659, which recorded landholding across Ireland following the Cromwellian settlement. There it is annotated as a single-storey structure with a cross on the east gable and a small bellcote on the west, and the accompanying terrier, a written description of the mapped land, notes the presence of a castle in repair with a bawn, an orchard, some ash trees, and the chapel of ease, all within the same townland. A bawn was a defensive enclosure, typically walled, built around or adjacent to a tower house. The castle in question stood in close proximity to the chapel, and Archerstown House lies roughly 420 metres to the north-northeast. By the time surveyors examined the site more closely in 1980, the north wall still held an aumbry, a small wall recess used to store liturgical vessels, but that feature has since disappeared as the wall itself has deteriorated to foundation level. The south wall shows a faint suggestion of a doorway near its west end, and the east wall has been levelled entirely.