These are typically boulders or flat rocks bearing cup-marks, crosses, or other carvings associated with a local saint, often incorporated into patterns of devotional movement known as a turas, where pilgrims walk a prescribed route, pausing to pray or perform ritual actions at specific stations. The stones themselves could be ancient, their origins pre-Christian, later absorbed into the practice of a newer faith.

Caher Island has long been recognised as a place of early monastic and pilgrimage significance. It lies in Clew Bay, roughly accessible from Roonagh Pier near Louisburgh, and contains the remains of an early Christian enclosure, oratories, and other ecclesiastical features that point to sustained religious activity over many centuries. The presence of a dedicated holy stone fits this wider pattern, forming part of a landscape that was almost certainly organised around a specific devotional life, possibly connected to Saint Patrick, to whom a number of sites in the region have a traditional association.