Measuring just 21 centimetres by 20 centimetres, and less than five centimetres thick, this small piece of a medieval cross-slab was found in the graveyard associated with the ruined church of Coolcashin in Co. Kilkenny, on a gentle east-facing slope in rolling grassland. What makes it quietly remarkable is not only what is carved on its surface but what is preserved on its underside: traces of mortar, evidence that the slab was at some point taken from its original context and built into a stone wall, most likely the graveyard wall itself. The carving was face-down in rubble while generations passed overhead.

The decorated face of the fragment shows incised straight lines forming a border, and within that frame the beginning of a double-lined curve, interpreted as the semi-circular terminal of one arm of a Latin cross. A cross-slab, in early medieval Irish usage, is a flat stone inscribed or carved with a cross, typically marking a grave or serving a commemorative function in a monastic or ecclesiastical setting. The Coolcashin example is too incomplete to date with certainty on its own, but comparable pieces offer useful context. Similar cross-slabs from Clonmacnoise, the great monastic site on the Shannon, have been assigned a suggested date of the late ninth to tenth century. Others from High Island off the coast of Co. Galway, dated by radiocarbon analysis of associated burials, point to the tenth or eleventh century. The Coolcashin fragment fits comfortably within that early medieval tradition, placing it in a period of active monastic culture across Ireland. The graveyard also contains at least one other cross-slab, suggesting the site had some significance beyond a simple rural burial ground. The cross-slab is no longer at Coolcashin itself; it is currently held at the parochial house in Lisdowney, a few kilometres away.