The ogham stone in question was not a standing monument in the usual sense but a lintel, built into the roof of an underground passage, its carved notches facing inward into the dark. It has since been removed, and nobody appears to know where it went.

The stone belonged to a group of four ogham stones associated with a souterrain, an underground stone-built tunnel and chamber system of the kind often constructed beneath early medieval ringforts for storage or refuge, found within the ringfort known as Lismore, or An Lios Mór, near Rathkenny in County Kerry. The fort itself is a multivallate rath, meaning it is enclosed not by one but by three concentric banks and ditches, a configuration that generally signals a site of some status. It sits on rising ground with wide views across the surrounding countryside. In the late 1970s, an opening was made into one of the souterrain's chambers, which at least revealed the quality of its construction: the drystone walling of the tunnels and chambers is clearly visible to anyone who looks in. Ogham, Ireland's earliest form of writing, consists of groups of notches and lines carved along the edge of a stone, usually recording a personal name in an early form of Irish. Finding ogham on a lintel rather than a freestanding pillar is unusual, and suggests the stone may have been repurposed from an earlier monument when the souterrain was built. The inscription was recorded before the stone was taken, but its current location remains unaccounted for.