A bullaun is a large stone, usually a boulder, into which one or more rounded depressions have been deliberately ground. The purpose of these hollows is not fully agreed upon; they may have served as mortars for grinding grain or pigment, as basins for water used in ritual or healing, or as markers associated with early Christian sites. What makes bullauns persist in the memory is the way they sit in plain sight, often overlooked, carrying centuries of possible meaning in a simple concavity worn into rock.

The townland name Roekilmeena contains traces worth pausing over. The element "kil" derives from the Irish "cill", meaning a church or monastic cell, and its presence here hints that this part of Mayo may once have supported an early ecclesiastical site of some kind. Bullaun stones are frequently found in association with such places, appearing near early churches, holy wells, and burial grounds across Ireland. Whether this particular stone belongs to that pattern cannot be confirmed from what survives in the record, but the topographical name alone suggests the area had some significance in the early Christian period.