It is a quietly telling detail: the building and its graveyard sharing material as well as ground, the architecture of worship repurposed to mark the dead.

The graveyard at Isertkelly is irregularly shaped, running roughly 49 metres on its longer axis, and is enclosed by a boulder-built stone wall with access through a gateway at its south-south-west side. The associated church occupies the northern end of the site. Most of the inscribed headstones date to the 18th and 19th centuries, though a considerable number of graves carry no inscription at all, marked only by plain block stones. The presence of so many uninscribed markers is a reminder of how much of the burial record from this period remains effectively anonymous, the names either never carved or long since lost to weathering and time. The repurposed mullion near the church's south-east corner sits among these as something slightly different: not a purpose-made memorial but a fragment of an earlier structure given a second function, connecting the fate of the building to the fate of those buried beside it.