Set into the top of the external face of the north-east wall of the nave, the fragment is easy to miss entirely, its funerary origins disguised by the fact that it has been trimmed and shaped into a rectangular block to fit the demands of construction rather than commemoration.

The stone dates to the 13th or 14th century and was originally a graveslab, the kind of flat marker laid over a burial, typically carved with a cross or inscription to identify the deceased. This one carries no inscription, but a circle is faintly discernible on its surface, possibly all that survives of a cross-head. The material is fossiliferous limestone, a stone in which the compressed remains of ancient marine organisms are visibly embedded, and which was widely used in medieval Kilkenny for both architecture and funerary carving. At some point, the slab was broken or otherwise reduced, and rather than being discarded, it was repurposed as building material, incorporated into the church wall where it has remained ever since. The precise moment of reuse is not recorded, but the practice of recycling dressed stone was commonplace throughout the medieval and post-medieval periods, particularly when a suitable piece was already to hand.