It carries no inscription, names nobody, and records nothing legible about whoever lies beneath it. What it does carry is a carefully incised floriated cross, its four arms each terminating in a fleur-de-lys, with a lozenge at the centre where the arms meet. The cross-shaft below repeats the same terminal. It is a formal, considered piece of work, and the person it once marked was clearly someone for whom such craftsmanship was considered appropriate.

The slab itself is just under two metres long, tapering from 65 centimetres at the head end to 44 centimetres at the base, which is the characteristic shape of medieval grave markers designed to follow the outline of a body. The stone is covered in lichen now, which softens its surface and makes close reading of the carving harder in certain lights. A portion has been cut from the lower right edge of the slab, and a small piece is broken away near the base on the opposite side. Whether these losses happened during later building work or through some earlier intervention is not recorded. Stylistically, the design places the slab in the thirteenth or fourteenth century, a period when floriated crosses of this type were a recognisable convention in Irish ecclesiastical stonework, particularly in areas with strong Anglo-Norman influence, as Kilkenny certainly had.

St Mary's in Callan is a substantial medieval parish church, and the slab's position in the nave, towards the western end of the centre aisle, means it would historically have been walked over regularly by a congregation. That kind of placement was not unusual; it was, in its way, a form of ongoing memorial, the community literally passing above the dead. The absence of any surviving inscription makes it impossible now to connect the stone to a name, a family, or a specific moment in the town's past. It remains anonymous, geometrically precise, and quietly doing the only job it was ever asked to do.