Joseph’s Church in Rathmullan, County Donegal. The stone, measuring 1.6 metres by 36 centimetres, bears the faint traces of a Maltese cross carved within a circle on one of its faces, though centuries of weathering have left only the upper portions barely visible. Its regular shape and deliberate carving suggest it once served as an important marker or memorial in the local landscape.

The slab’s original location tells an intriguing story of hidden history. Local tradition holds that it once stood beside the entrance to a souterrain, one of those mysterious underground passages that dot the Irish countryside, typically dating from the early medieval period. While no trace of this subterranean structure remains visible today in the gently rising pasture where the stone once stood, the association hints at a site of some significance, perhaps marking a boundary or serving as a waymarker for those who knew to look for the concealed entrance below.

The relocation of such stones to church grounds was a common practice in Ireland, often done to preserve them from damage or loss whilst keeping them within the community. This particular example was documented in the comprehensive Archaeological Survey of County Donegal in 1983, which catalogued the county’s field antiquities from the Mesolithic period through to the 17th century. Today, visitors to St. Joseph’s Church can still make out the weathered cross design, a tangible link to the area’s early Christian heritage and the now-vanished underground world it may once have guarded.