Somewhere in the burial ground of Killeen Cormac, near Colbinstown in County Kildare, there may or may not be a standing stone carved with a plain cross. The uncertainty is the point. When the antiquarian Fitzgerald recorded it between 1899 and 1902, it was physically present and measurable, a slab of green flagstone rising about four feet from the ground, two feet across, and roughly five inches thick, bearing a cross just under two feet long with arms spanning eighteen inches. Fitzgerald noted the workmanship as "very rude", meaning unrefined rather than offensive, the kind of blunt, unadorned carving typical of early medieval cross-slabs in Ireland. These slabs, usually set upright over or near a grave, served as simple Christian grave markers, often cut without inscription or decorative ambition. At some point after his visit, this one ceased to be findable.

The ambiguity runs a little deeper still. Fitzgerald may have been describing one of two separate slabs at Killeen Cormac, and it is not certain which stone his description belongs to. Killeen Cormac itself is a site with considerable early medieval associations, the kind of burial ground that accumulated layers of use across centuries. What Fitzgerald saw and measured is now unlocated, which could mean it has been buried, moved, broken, or simply overlooked in subsequent surveys. The description survives; the object, for now, does not.