It appears on a plan drawn by the scholar R.A.S. Macalister during his survey of the island's Saint's graveyard in 1916 to 1917, rendered carefully enough to be identified and located today, yet assigned no catalogue number among its neighbours. That small omission gives it an oddly anonymous quality, as though it slipped through the record sideways.

The slab itself is recumbent, meaning it lies flat over the grave rather than standing upright, and it carries no decoration of any kind. Its surface is rough and uneven, the stone untrimmed and unpolished. It measures just over a metre and a half in length, wider at the head end than at the foot, tapering from roughly half a metre across at the top to less than a quarter of a metre in the lower third. Within the eastern half of the Saint's graveyard, it sits about twelve and a half metres from the northern wall and two metres from the eastern wall, coordinates precise enough to locate it on Macalister's plan but doing nothing to explain who lies beneath it. The Saint's graveyard on Inis Cealtra is one of several ecclesiastical enclosures on the island, which was a significant monastic site from the early medieval period. The absence of any inscription or carving means the person commemorated here left no name, no status, no claim on memory beyond the stone itself.

Inishcaltra is accessible by boat from Mountshannon on the Clare shore, and the graveyard sits within a complex of monastic remains that includes round towers and early churches. The slab is easy to overlook precisely because it announces nothing about itself.