What it does carry is a floriated cross, that is, a cross whose arms terminate in stylised floral or leaf-like decoration, carved into its upper face. It is a little over a metre long and just over half a metre wide at the top, narrowing to thirty centimetres at the base, and twelve centimetres thick. Beside it to the north lies a broken companion slab, and together they form part of a group of four arranged in a line at the western end of the aisle.

The group belongs to a tradition of graveslab carving that flourished in Connacht during the thirteenth and fourteenth centuries. The similar slabs found elsewhere in the same church have been dated to that period, placing them in the era when Athenry was one of the most significant Anglo-Norman towns in the west of Ireland, a walled settlement with a Dominican friary, a castle, and a degree of civic ambition unusual for the region at the time. The floriated cross design was common across medieval Gaelic and Anglo-Norman graveslab traditions, and while it is not a rare motif in itself, the concentration of these slabs in a single aisle, four in close sequence, gives the site a particular quiet density. Whoever commissioned them left no inscription, which was not unusual for the period; carving a cross was enough of a statement.