In 1916, in the garden of No. 97 Lower Mount Street, a grave slab came to light that had no obvious business being there. Lower Mount Street is a Georgian terrace, the kind of address associated with solicitors and tenement histories, not early medieval burial practice. Yet the stone was unmistakably old, and unmistakably significant.

The slab dates to around the 9th or 10th century and belongs to a tradition of Early Christian memorial carving that was widespread across Ireland during that period. What makes this particular example notable is that it is decorated on both faces, each bearing a ringed cross. The ringed cross, sometimes called a Celtic cross, is a form in which a circle intersects the arms of the cross, a design common in insular Christian art from roughly the 7th century onwards. Having the motif carved on both sides of a grave marker is less usual, and suggests some care and intention in its making. How it came to rest in a suburban garden rather than at any identifiable ecclesiastical site is not recorded. Dublin's medieval and early Christian topography was layered and, in many places, lost; the stone may have been moved, reused, or simply forgotten as the city grew around it. The discovery was communicated personally by P. Healy, and is catalogued in a 2009 edited volume by K. Swords.

The slab itself is now held in the National Museum of Ireland in Dublin, which is the practical destination for anyone wanting to see it. The museum's collection of Early Christian stonework is substantial, and the piece sits within a wider context of similar carvings from across the country, which helps to make sense of its style and date. The garden on Lower Mount Street where it was found is a private address and holds nothing visible today; the interest lies entirely in the object and what its presence in that location implies about the buried geography of the city.