Centuries of burials, both within the building and pressing close around it, have slowly raised the earth until the surrounding graveyard feels almost sunken by comparison. That quiet geological fact, the ground swelling upward with the dead, gives the place an atmosphere that no amount of collapsed masonry quite explains on its own. What remains of the church is a rectangular shell, roughly 26 metres long and nearly 9 metres wide, with walls a solid 1.6 metres thick. The south wall still holds a pointed doorway of cut limestone, barely a metre wide and less than that in height, and beside it towards the east end, a largely defaced window whose interior once carried a round arch of limestone. The east and west gables are gone entirely, and the north wall has been reduced to little more than a low course of stone.

The church takes its name from the Irish Cill Mhaoile, and its documented history runs back at least to 1302, when a papal taxation of the Diocese of Ardfert listed the church of Kilmoli with an annual valuation of 20 shillings and a tithe of 2 shillings. That taxation was part of a broader European effort to assess church revenues, and the modest sum attached to Kilmoyly suggests a small but functioning rural parish on the northern Kerry coast. The Stack family appear more than once in the later medieval record here. In 1479, following the death of a David Stack, the vicarage was granted to Philip Stack, Bishop of Ardfert, who made the unusual claim that local laymen had seized so much of his episcopal income that he could barely sustain himself with the dignity his office required. By 1615, the church appears in the Royal Visitation of the Diocese of Ardfert under the name Rectoria de Kilcoylly, listed as belonging to a preceptory and farmed by Sir Richard Boyle, the energetic New English planter who would later become the first Earl of Cork. His name appearing in a rural Kerry visitation record is a reminder of how thoroughly the Munster plantation had reorganised ecclesiastical as well as landed arrangements by the early seventeenth century.