Within its boundaries, local tradition holds that a lisín once existed, a small, informal burial ground used for unbaptised children, of the kind found scattered across rural Ireland where Catholic doctrine long prohibited such infants from consecrated ground. No grave markers remain, no earthwork betrays the spot, and no surface trace survives to confirm what people in the area nonetheless remember.

The ringfort itself, a roughly circular enclosure defined by earthen banks, is a common enough feature of the Irish landscape, most dating from the early medieval period roughly between the fifth and twelfth centuries. They served as farmsteads and centres of small-scale settlement. That a lisín should sit within one is not entirely surprising; these enclosed spaces, already set apart from ordinary land, were sometimes repurposed in later centuries as informal burial grounds for those excluded from churchyard burial. The word lisín, a diminutive of the Irish lios meaning fort or enclosure, came to describe these children's burial grounds specifically, the term borrowing something of the older, otherworldly associations that clung to such ancient earthworks in folk memory. At Ardfintan, the tradition is preserved, but the physical evidence, if it ever existed above ground, has long since been absorbed back into the grass.