These curious stone basins, carved from solid rock, are scattered across Ireland and have puzzled archaeologists for generations. The example at Drumalough features the characteristic bowl-shaped depression that gives these monuments their name, derived from the Irish word ‘bullán’, meaning a round hollow in stone.

Bullaun stones likely served multiple purposes throughout history, though their exact original function remains something of a mystery. Some archaeologists believe they were used for grinding grain or herbs, whilst others suggest they held religious significance in pre-Christian Ireland, possibly used for ceremonial washings or offerings. Many bullaun stones were later adopted by early Christian communities, with the water that collected in their basins thought to possess healing properties; a belief that persisted well into the modern era in rural Irish communities.