Ogham is an early medieval script, typically carved as a series of notches and strokes along the edge of a stone, used in Ireland roughly from the fourth to the seventh centuries to commemorate the dead, often in the formula "X, son of Y". The stone at Liscahane was not standing upright in a field or mounted in a museum when people first took notice of it. It was lying flat underground, serving as a roof lintel inside a souterrain, the kind of stone-lined underground passage often associated with ringforts, likely used for storage or refuge. The inscription was still readable even in that position.

The stone came to light in 1981, when quarrying disturbed a ringfort at Liscahane and exposed a souterrain beneath it. Excavation followed, and in chamber 2 of that souterrain, two ogham stones were found reused as lintels, a fairly common fate for such monuments, repurposed by later inhabitants who may or may not have understood what the carvings meant. This particular stone measures 1.90 metres by 0.40 metres by 0.15 metres, and its inscription reads COLMANN MACI COMGGANN, meaning Colmann, son of Comggan. Both personal names are Irish, and the formula is characteristic of early medieval commemorative ogham. After excavation, the stone was moved first to Millstreet Community School and subsequently to Millstreet Museum, where it is now on display. The site at Liscahane is the original findspot, not a place where anything visible survives above ground, but the museum in Millstreet is where the stone itself can now be seen.