Known in Irish tradition as a cillín (the diminutive of cill, meaning a small church or burial cell), children's burial grounds like this one were used for centuries to inter unbaptised infants, along with others considered, by the rules of the institutional Church, ineligible for consecrated ground. Stillborn children, those who died before baptism, and sometimes suicides or strangers, were quietly laid here instead, in places that sat at the margins of parish and community life, neither fully sacred nor entirely forgotten.

These sites are found across Ireland in their hundreds, often occupying older, pre-Christian or early medieval enclosures, ringfort interiors, or coastal edges. The choice of location was rarely arbitrary. Old ground already carried a kind of sanctity in the popular imagination, and families who could not bury their children in the churchyard nonetheless sought a place that felt set apart. The grief attached to cillíní was largely private, the burials often conducted at night or at dawn, without clergy, without ceremony. What survives at Mulroog is this quiet category of place, a site whose significance lies less in any monument above ground than in what its existence says about the gap between official religious practice and the ways ordinary people in rural Ireland navigated loss.