This cross-inscribed pillar, originally located in Killycolman, was marked on early Ordnance Survey maps as a standing stone, though its Christian symbolism suggests a more complex history. The slab, measuring 1.6 metres high, 0.36 metres wide, and 0.2 metres thick, bears the faint traces of a Maltese cross enclosed within a circle, incised into one of its faces. While time has worn away much of the upper portions of this carving, enough remains to hint at its religious significance.

Local lore adds an intriguing dimension to this monument’s story, as it was allegedly positioned beside the entrance to a souterrain, one of those mysterious underground passages that dot the Irish landscape. Though no trace of this subterranean structure remains visible today, the association speaks to the layered history of the site, where Christian monuments often marked or repurposed earlier sacred spaces. The pillar’s regular shape and deliberate carving suggest it served as a territorial or religious marker, perhaps delineating church lands or commemorating a significant event.

Today, visitors won’t find the stone in its original location; it has been relocated to the grounds of St. Joseph’s Church in Rathmullen, where it continues its long watch over Donegal’s landscape. This move, while preserving the monument from potential damage or loss, has separated it from its archaeological context, leaving us to wonder about the full story of its placement and the vanished souterrain it once guarded. The stone stands as a tangible link to medieval Ireland, when such monuments served both spiritual and practical purposes in marking boundaries, commemorating the dead, or sanctifying the landscape.