At Kilcommadan in County Galway, a medieval church once occupied the south-western corner of what appears to have been an early ecclesiastical enclosure, the kind of roughly circular or oval boundary that in Ireland typically marks a monastic or early Christian foundation of considerable age. Until relatively recently, a subrectangular stony foundation roughly ten metres by six metres was still visible at the spot, a quiet remnant of dressed and tumbled stone that at least gave the eye something to settle on. That is now gone. Farm buildings have been constructed in the vicinity, and no surface trace of the church survives.

The place still carries its name, which preserves a memory the ground no longer does. "Kilcommadan" follows the common Irish pattern of cill, meaning a church or monastic cell, combined with a personal name, suggesting a foundation associated with a figure called Commadan, though nothing further about this individual is recorded here. The church itself appears in the Ordnance Survey Letters compiled by John O'Donovan and his colleagues in the 1830s, later published by Michael O'Flanagan in 1927, which refer simply to "the old church of Kilcommadan". The first edition of the six-inch Ordnance Survey map, produced in the nineteenth century, shows it as an unroofed rectangular building oriented east to west, which is the conventional Christian alignment placing the altar end toward Jerusalem. That the building was already roofless by the time the surveyors arrived suggests it had been out of use for some considerable time before even those records were made. Also associated with the site is a cillin burial ground, the term used in Ireland for informal, often unconsecrated burial places typically used for unbaptised infants or others excluded from consecrated ground, a common feature of early ecclesiastical landscapes.