It is one of three ogham stones recovered from a single souterrain at Ahalisky, Co. Cork, a souterrain being a man-made underground passage or chamber, typically stone-lined, associated with early medieval settlement. That three inscribed stones should have ended up together in such a structure is already unusual; that this particular example should have travelled to Dublin makes its story stranger still.

The scholar R. A. S. Macalister catalogued the stone in 1945, recording its dimensions as five feet tall, two feet and one inch wide, and eight and a half inches thick. He transcribed the inscription as CUNAGUSOS MAQUI MUCOI VIRAGNI, a formula typical of early Irish ogham stones, broadly meaning something like "of Cunagusos, son of the tribe of Viragnus". Ogham itself is a script of the fourth to seventh centuries, in which letters are represented by groups of notches and strokes cut along a central stemline, usually the edge of a stone. What makes this example technically interesting is where the carving sits: Macalister noted that the letters are cut at a very obtuse angle across the middle of one of the broad faces of the slab rather than along its edge, with only the final few letters wrapping onto the edge at the top. That is a departure from the more conventional edge-cut arrangement. The stone has since been examined as part of the Ogham in 3D project run by the School of Celtic Studies at the Dublin Institute for Advanced Studies, which has produced detailed digital records of ogham stones across Ireland; its entry can be found on that project's database under reference CIIC 70.

The notes describe this as the stone's present location in Dublin South City, though no specific building or institution is named in the available record. Visitors with a particular interest in the inscription itself may find the Ogham in 3D database the more rewarding starting point, since it provides high-resolution imagery and full epigraphic detail that can be difficult to read on the stone's surface directly. The original find site at Ahalisky, Co. Cork, where the souterrain containing all three stones was discovered, is recorded separately in the archaeological record under the Cork county references, should anyone wish to trace the stone back to where it began.