The one at Killaghoor in County Mayo belongs to this tradition, a category of site that speaks quietly to the intersection of Catholic doctrine, rural poverty, and the grief of parents who had no sanctioned place to bury their infants. Under older Church teaching, children who died before baptism could not be buried in holy ground, and so communities found their own solutions, often choosing liminal spaces such as old ringfort interiors, coastal boundaries, or forgotten corners of fields.

These cillíní were rarely formally recorded in their own time, and many survive only because local memory preserved knowledge of them across generations. The name Killaghoor itself likely contains the Irish element "cill", meaning a church or burial place, which hints at some earlier ecclesiastical association in the area, though the precise history of this particular site in Mayo remains incompletely documented. As places of burial, cillíní were used well into the twentieth century in parts of Ireland, and their continued presence in the landscape is a reminder of how recently those social and religious pressures shaped ordinary life.

The site at Killaghoor is recorded as a monument, though detailed information about its physical extent, any surviving markers, or its exact condition on the ground is not currently available. Visitors to such sites generally find little that announces itself, perhaps a slight rise in a field, a cluster of small unmarked stones, or a perimeter that is slightly different in vegetation from the surrounding land. That quietness is, in a sense, the point.