It is easy to walk past without a second glance, which is part of what makes it worth pausing over. The slab carries an incised cross, its shaft rising from a fleur-de-lis base, with the head of the cross carved at the upper end. At over two metres long and just eight centimetres thick, it is a substantial piece of medieval stonework, the kind of object that tends to accumulate centuries of foot traffic and indifference in roughly equal measure.

Cross-slabs of this type, flat funerary stones carved with a cross and set horizontally over or near a burial, were common across medieval Ireland and Britain. This example dates from the fourteenth or fifteenth century, placing it within the late medieval period when St. Mary's Cathedral was already well established as the principal ecclesiastical building in Limerick city. The slab is recorded in the Urban Survey of Limerick, compiled by Bradley and colleagues and published in 1989, which describes it in precise terms: black limestone, incised with a two-line cross on a fleur-de-lis base. The fleur-de-lis, a stylised lily motif with roots in heraldry and ecclesiastical decoration across western Europe, appears here as the decorative foot from which the cross shaft rises, a small detail that connects a Limerick grave marker to a much wider visual vocabulary of medieval Christian art.

St. Mary's Cathedral is open to visitors and sits near the southern end of King's Island, the oldest part of the city. The cross-slab is inside the building, set into the tomb transept, so no particular conditions of weather or season affect access to it. What rewards attention is the incised carving itself, which can be difficult to read depending on the light; low, raking light across the stone tends to bring out the shallow lines of the cross and its base more clearly than direct overhead lighting. It is a modest object by most measures, but its age and its quiet persistence in a working cathedral give it a particular kind of presence.