It is the head of a twin-light ogee-headed window with sunken spandrels, the kind of decorative Gothic stonework that would have graced a reasonably well-appointed ecclesiastical building. The medieval church of Kiltallagh, known in Irish as Cill Tulach, once occupied this same ground, and the later Protestant building dedicated to St. Carthach was raised in its place, leaving only scattered remnants to suggest what came before.

By 1871, when the historian Cusack documented the site, the situation was already one of layered replacement and fading memory. The medieval fabric had long since given way, though stones from the old building were still visible around the graveyard. One of these, noted separately as the Cloghmacudda, or Cloch-Mochaeda, is a stone hollowed in the shape of an inverted cone, associated with St. Carthage Mochaeda, around which people traditionally walked or paid rounds, a devotional practice of circumambulation common at many Irish holy sites. The graveyard itself sits within a circular enclosure, the northern boundary of which doubles as the townland boundary with Meanus, a shape that often signals an early ecclesiastical origin. A field to the southwest was still being called Church Field on the Ordnance Survey six-inch map of 1841, suggesting that local knowledge of the site's sacred character outlasted the physical church by centuries. The parish of Kiltallagh falls within the diocese of Ardfert, in the barony of Trughanacmy, and the carved window head now sitting quietly at the corner of a Victorian-era church is one of the few remaining indicators of the medieval community that once gathered here.