The enclosure at Rathcannon, County Limerick, is a case study in exactly that kind of quiet correction. Recorded on maps and databases as a potential antiquity, it has since been reassessed as nothing more ancient than a small post-medieval field boundary, a modest rectangle of pasture that accumulated a little mystery simply by surviving long enough to be noticed.

The feature first appeared on the Ordnance Survey Ireland six-inch map of 1840, depicted as a sub-rectangular area measuring roughly 20 metres north to south and 27 metres east to west, enclosed by a field boundary. Crucially, the cartographers of the time did not flag it as an antiquity; it was recorded simply as a small field. By the time the 25-inch edition was published in 1897, it had disappeared from the map altogether, suggesting the field was levelled sometime in the intervening decades. Its proximity to a genuine ringfort, known locally as Lisheengorm and lying about 220 metres to the west, may have lent it an air of archaeological possibility it did not entirely deserve. In 2000, test excavations were carried out to the south of the enclosure by Rose Cleary, under licence number 00E0840. The results were unambiguous: no archaeological features or finds were uncovered. Subsequent orthophotography, including OSi imagery taken between 2005 and 2012 and Google Earth images, confirmed that no surface remains are visible today.

For anyone curious enough to seek it out, the site sits in pasture behind two modern dwellings, and there is genuinely nothing to see. That absence is, in its own way, the point. The record compiled by Fiona Rooney and uploaded in April 2021 is a reminder that archaeological inventories are living documents, subject to revision as new surveys and excavations accumulate. Lisheengorm, the neighbouring ringfort, remains the legitimate focus of local interest in the area, and its earthworks are a more rewarding object of attention for anyone passing through Rathcannon.