This is a bullaun stone, a type of ancient carved rock featuring one or more cup-shaped depressions, found across Ireland and often associated with early Christian sites, folk cures, and ritual practice. What makes this particular example memorable is its local name: the Ballyknockan Wart Hole.

The boulder measures roughly two metres wide and half a metre in height, with the cavity sitting off-centre, about half a metre in diameter and twenty centimetres deep. That name, recorded by O'Reilly in 1995, points to a longstanding folk belief attached to bullaun stones throughout Ireland, whereby the water that collects in the hollow was thought to have curative properties, particularly for skin complaints like warts. The belief is not unique to Ballyknockan, but the survival of such a specific local name here suggests the tradition was genuinely embedded in the community rather than being a vague, inherited association. Wicklow's granite landscape supplied the raw material for both the stone itself and, famously, the nearby quarry village of Ballyknockan, which produced granite used in buildings across Dublin and beyond. The boulder, by contrast, belongs to an older and less documented layer of the area's history.