Somewhere beneath or immediately behind a shallow depression in the ground, recorded on Ordnance Survey maps as far back as 1839 and still visible on the 1947 revision, lies what local tradition identifies as an obliterated churchyard. The church itself has left no trace above ground. What anchors the site in memory are two older features nearby: a holy tree and a bullaun stone, a bullaun being a boulder with one or more cup-shaped hollows worn into it, associated across Ireland with early Christian and pre-Christian ritual use.

The townland name preserves the whole story in compressed form. Kilmogga, the older Irish version, translates as the church of St. Magadh, a saint otherwise obscure but clearly significant enough to give her name to the landscape here. By the thirteenth century the site had been absorbed into a broader pattern of Anglo-Norman ecclesiastical reorganisation. William Marshall the younger, Earl of Pembroke from 1219 to 1231, granted the land of Kilmeggeth, along with several neighbouring parcels amounting to ten carucates, a carucate being a unit of land roughly equivalent to what a team of oxen could plough in a year, to the Cistercian Abbey of St. Saviour at Duiske, now Graiguenamanagh. The grant was made in frankalmoign, meaning the land was given freely to a religious institution in exchange for prayers rather than military or financial service. That transaction is recorded in a thirteenth-century charter cited in the Calendar of Documents relating to Ireland.

The gravel pit that tradition connects with the churchyard sits in the field immediately south of what the Ordnance Survey map labels St. Patrick's Bush, running along the roadside. The holy tree and the bullaun stone remain the most tangible presences at the spot, quiet markers for a church that has otherwise entirely disappeared into the ground beneath them.