A mullion is the vertical or dividing element within a window frame, and a trefoil head refers to the three-lobed, clover-like arch form common in Gothic ecclesiastical and castle architecture. That such a piece, decorative and carefully cut, should end up repurposed as a grave marker for a child is quietly arresting. It speaks to the practical intimacy with which people once related to the ruins around them, taking what was available and giving it new meaning.

The stone almost certainly originated at Rathgorgin Castle, which stands roughly a hundred metres to the south-west. The proximity makes the source plausible, and the quality of the carving, a window mullion with a shaped head rather than a plain slab, suggests the castle was once a building of some architectural ambition. Children's burial grounds, known in Irish as cillíní, were traditionally used for unbaptised infants and others who, under Catholic practice, could not be interred in consecrated ground. They tend to occupy marginal spaces, old ringforts, ancient enclosures, or land set apart from the main parish cemetery, and the grave markers within them are often improvised or repurposed, which makes the presence of this dressed architectural fragment less surprising in context, even if the specific choice remains poignant.