This limestone building in Killeany, County Clare, sits within a wider ecclesiastical enclosure alongside a rectangular graveyard, and what survives is a remarkably complete medieval structure: nave, chancel, chancel arch, gable windows, an altar tomb, and even a small aumbry, a recessed wall cupboard used to store sacred vessels, tucked into the corner of the chancel's south wall and east gable. The masonry tells its own layered story. The inner wall-face is built of roughly squared, coursed limestone blocks, while the outer face uses larger and rougher stone. Noticeably bigger blocks mark the older work, and an earlier gable line is still legible about 1.5 metres below the current height of the east gable, suggesting the building has been modified or extended at some point in its life.

The church's association with St Éinne, also known as Enda of Aran, places its origins in the fifth century, though the visible fabric is considerably later. Éinne is one of the more prominent figures in early Irish monasticism, principally associated with the Aran Islands, but his name attaches to this Clare foundation too. The disciplinary streak attributed to him appears in a local tradition recorded by Swinfen in 1992: when the monks at Killeany grew lax in their religious duties, the saint punished them by driving the fish from a nearby stream. The pointed chancel arch, which is built from well-dressed stone but shows signs of stress as the wall slowly spreads apart, sits alongside ogee-headed windows in the nave walls, a decorative piece of knotwork carved beside the hood moulding of the east window, and the remains of what may have been a stoup, a basin for holy water, now only a broken corbel projecting from the chancel wall. Ordnance Survey maps from 1842 and 1916 both name and indicate the church, suggesting it had already been long out of use by the time it was first formally mapped.