Cross-slabs, flat or roughly upright stones incised with a cross rather than fully shaped into a free-standing monument, represent an earlier and less elaborate tradition than the ornate high crosses that tend to attract more attention. They are often associated with early Christian enclosures, burial grounds, or places of local devotion, and can range from a simple scratched outline to a more carefully dressed surface with decorative knotwork or inscription. The example at Drum belongs to this understated tradition, the kind of object that can sit in a field or churchyard for centuries without drawing much notice.

Beyond its classification and location, the documentary record for this particular slab is, at present, thin. What can be said is that cross-slabs of this type in the west of Ireland generally date from somewhere within the early medieval period, roughly the sixth to the twelfth centuries, and their presence in a given townland is often the only surviving trace of a religious or funerary site that has long since disappeared above ground. Drum, like many Mayo placenames, carries its own quiet freight of history, and the existence of a carved slab there suggests some form of early Christian activity in the area, even if the precise context has not been documented in any surviving source currently available.