Built into its southern face is an Early Christian cross-slab bearing a Goidelic inscription, an early form of Irish script predating the familiar medieval manuscript hand. Scattered nearby on the graveyard surface are limestone blocks that were once part of a chamfered pointed arch, the dressed stonework of a medieval doorway. A few metres to the north of the wall, lying on the grass, is a keystone decorated with an IHS monogram, a Christogram common in post-Reformation Catholic devotional architecture, dating from the late seventeenth or early eighteenth century. These are not the remnants of one building but the overlapping traces of several, compressed into a small and heavily overgrown space.

The site sits within the former parish of Ballyloughloe, a name derived from Lough Luatha, a lake immediately to the north. The medieval church here was dedicated to the Holy Trinity, and by 1302 to 1306 its rector was recorded in the ecclesiastical taxation of the diocese of Clonmacnoise as owing twenty shillings. In 1405 the annals note that Cormac Óg, son of Cormac Ballach of the Ó Maoil Sheachlainn family, burned the settlement and the church, destroying among other things the image of the Trinity. The church was evidently rebuilt or continued in use, since a papal letter of 1451 describes a reorganisation of its parish arrangements: Bishop John of Clonmacnoise had divided the mother church of Lochluacha and its two daughter churches into three separate perpetual vicarages, covering Ballyloughloe, Athlone, and Kilcleagh, partly on the grounds that the parish was so large and the roads so dangerous that parishioners could not safely reach their church. By 1656, when the Down Survey mapped the area, the church was already annotated as being in ruins. John O'Donovan, collecting information for the Ordnance Survey in the early nineteenth century, noted an old woman of ninety-three who remembered the chapel still roofed and slated with oak shingles; local tradition attributed its construction to the Magawleys, chiefs of Calree. That same modest structure, later shown on the 1840 Ordnance Survey map as a Catholic chapel, is represented by the upstanding wall at the centre of the graveyard, nine metres south of the collapsed remains of the post-medieval Holy Trinity Church of Ireland building.