Most people walking past would have little reason to stop. The stone, however, has travelled considerably in its long life, and its current position marks only the latest chapter in a history that stretches back through the medieval period and into the early Christian era.

This is a bullaun stone, a type of roughly worked boulder bearing one or more cup-shaped depressions, ground into the surface by repeated circular motion. Bullauns are commonly found at early ecclesiastical sites across Ireland, and while their precise function is debated, they are associated with cursing, healing, and ritual use of water that collects naturally in the hollow. This particular example was formerly housed inside the tower of the medieval church at Lusk, a significant early Christian site a short distance away. The antiquarian Hunt, writing in 1974, recorded what was then kept within that tower: a seventeenth-century font, the bullaun stone, and a portion of a fireplace that had been removed from Bremore Castle. That fireplace fragment was no ordinary architectural salvage; it was decorated in false relief with six shields bearing heraldic arms arranged around a depiction of the Annunciation, a detail first noted by Roe in 1979. The grouping of these three objects inside the Lusk tower tells something about how earlier communities gathered and preserved fragments considered worth keeping, even when their original context had been lost.

The church at Greatcommon is straightforward enough to locate, and the bullaun stone can be seen outside the main entrance without any need to go inside. It is an easy stop if you are already visiting the Lusk Heritage Centre, which occupies the medieval tower and houses several other early Christian and medieval finds associated with the site. The stone itself rewards a close look; running a hand around the interior of the hollow gives a physical sense of the repetitive motion that shaped it over generations. There is no interpretive signage accompanying it at present, so knowing something of its history beforehand makes the difference between a puzzling lump of rock and an object with a genuinely long and complicated story behind it.