The enclosure at Rockfield, known locally as 'Lisheen', a diminutive of the Irish word 'lios', meaning a ringfort or enclosed place, holds its history entirely below the surface. According to local tradition, the interior was used for the burial of unbaptised infants, and nothing visible now marks that use.

Places like this, known across Ireland as cillíní or cilliní, were informal burial grounds set aside for those whom Catholic doctrine historically excluded from consecrated ground: unbaptised babies, stillborns, and sometimes suicides or strangers. The practice was rooted in a theological position, later revised, that held unbaptised children in a state of limbo, neither admitted to heaven nor condemned to hell. Without the sacrament, they could not be buried in the parish churchyard, and so families turned to marginal or liminal spaces, old enclosures, boundaries, shorelines, and places already set apart from ordinary use. The Lisheen at Rockfield was one such space. The enclosure itself predates any of this use by centuries, its origins almost certainly prehistoric or early medieval, and its rounded earthen form would have given it the quality of somewhere already outside the everyday world.