It measures roughly forty centimetres by thirty, and for most of its existence it has probably gone unnoticed by anyone passing through. What makes it quietly remarkable is what is carved into its upper surface: a Latin memorial inscription, almost certainly displaced from a grave, that records the death of a woman named Margaret O'Dinighen in 1666.

The inscription, as transcribed and discussed by Lynch in the Journal of the Royal Society of Antiquaries of Ireland in 1910, reads something like 'X MARGARET O'DINIGHEN, EJUS 1666, VXOR, HIC JACET', the Latin translating roughly as 'here lies Margaret O'Dinighen, his wife, 1666'. The formula is conventional enough for the period, but the stone's situation is anything but. Rather than marking a grave, it was repurposed at some point to fill a gap in the church wall, turning a personal memorial into building material. Rattoo Church, a medieval structure in the townland of Rattoo, sits beside one of the better-preserved round towers in Kerry, those tall, tapering stone towers built from the early medieval period onwards, most likely as bell towers and places of refuge associated with monastic settlements. The stone's original placement within or around that complex is unknown, and the question of how Margaret O'Dinighen came to be memorialised there, and by whom, has no clear answer from the surviving record.