That last detail has a particular weight in Ireland, where wells associated with early Christian foundations were often understood to possess curative or sacred properties, their permanence taken as evidence of divine favour. This one has no recorded name, but its presence is confirmed on the first edition Ordnance Survey six-inch map of 1839, which at least establishes it had already been there long enough to be considered worth marking.

The wider site connects to a figure named in the Martyrology of Donegal, a seventeenth-century compilation of early Irish saints' feast days. The relevant entry reads: 'Bairfionn, son of Aedh, of Achadh-Cailltean in the Uí Drona, west of the Berbha, in Uí Reithe, to the south of Leithglinn.' The place name Achadh-Cailltean, meaning roughly 'field of the lost wood' or 'field of the wood', is the probable origin of the modern townland name Aughkiletaun. The Uí Drona were a dynasty whose territory lay in what is now south Kilkenny and parts of Carlow, with the river Berbha, now the Barrow, forming a significant boundary in the region. Leithglinn, just to the south of Leighlinbridge in Co. Carlow, provides an additional geographical anchor. Bairfionn himself is otherwise obscure, but the mention in the Martyrology points to an early medieval monastic foundation here, likely dating to the period between the sixth and ninth centuries when such small, locally rooted communities were scattered across the Irish landscape.