Known locally as Killwee, this ground in Rathlackan was, according to tradition, reserved for the burial of unbaptised babies, placing it within a broader Irish practice that shaped the landscape in quiet, largely unrecorded ways. The Catholic Church once refused consecrated burial to infants who died before baptism, and so communities created their own spaces, often in ancient enclosures or at parish boundaries, to inter these children. These places are sometimes called cillíní, and they scatter the Irish countryside in their hundreds, most of them modest to the point of near-invisibility.

The enclosure at Rathlackan appears on the 1838 Ordnance Survey six-inch map simply as "Grave Yard", a designation that gives little away. By the time the 1922 edition was produced, the cartographers had grown more specific, marking it plainly as "Children's Burial Ground". A few low stones protrude from the ground inside the enclosure, uninscribed, and thought to be grave markers, though none carries a name or a date. The local name Killwee was recorded by Aldridge in 1969, and the prefix "kil" or "kill" typically derives from the Irish "cill", meaning a church or monastic cell, suggesting the site may have older associations than its more recent use implies.