No one recorded why it was placed there, or whether it marked something. It simply stands, anomalous, within a structure that was already being described as dilapidated more than a century ago.

Cahermoyle sits on elevated ground in the townland of Cragreagh in County Clare, with open views in most directions and a hill rising to the north-west. A cashel is a stone ringfort, typically of early medieval date, built with drystone walls to enclose a settlement or farmstead. This one is roughly circular, measuring about 30 metres north to south and 28 metres east to west internally, and it sits within a larger ancient field system. John O'Donovan noted it in 1839 under the name Caher-Mael, and Thomas Johnson Westropp, who surveyed many Clare monuments at the turn of the twentieth century, visited in 1901 and found it 'featureless and much dilapidated', recording walls roughly 2.4 metres high and 2.1 metres thick. Today the structure survives unevenly. The inner wall-face is best preserved to the north, where it still stands nearly a metre high internally, but deteriorates considerably towards the west. Externally, the southern stretch reaches 1.8 metres, and the large regular blocks there are set on their sides in a noticeably deliberate manner. At the north-north-west, where the wall visibly thickens, there is an original entrance 1.8 metres wide, its rock floor still intact beneath it.

The cashel is named on the Ordnance Survey six-inch maps of both 1842 and 1915, which places it firmly in the documented landscape even as its fabric continued to erode. Westropp's dismissal of it as featureless sits oddly against the specificity of what survives: an original entrance, a level interior, and that single outsized stone whose purpose remains unrecorded.