Ogham is an early medieval Irish script in which letters are represented by groups of notches and lines cut along the edge or ridge of a stone, most commonly associated with commemorative inscriptions. That these particular stones ended up as building material in a souterrain, an artificially constructed underground passage or chamber typically used for storage or refuge, tells its own story about how the significance of earlier monuments was sometimes repurposed rather than revered.

The stone documented here is a sandstone boulder roughly 1.4 metres long, found in the outer part of the entrance passage of the souterrain. What makes it particularly curious is where the inscription sits: along a ridge of the stone rather than along an edge, which is the conventional surface for ogham carving. The text is incomplete, and what survives has been read by Fionnbarr Moore as R...CTVI, with either an E or an I following the initial R. The gaps are as significant as the letters; whatever name or formula the inscription once carried is now only partially recoverable. The reading draws on work published by Eogan in 1990, and the fragmentary nature of the text means the stone raises more questions than it answers about who carved it, what it originally marked, and when it was stripped of that function and pressed into service underground.