It survives only as a mark on a map, a single appearance in the historical record before quietly vanishing from the official documentation that replaced it.

The evidence comes from the first edition Ordnance Survey six-inch map of 1837, which recorded a univallate enclosure, meaning a roughly circular earthwork defined by a single bank or ditch, with a diameter of eighteen metres, sitting within the grounds of Claremont Villa. A univallate enclosure of this type is a common form of early medieval settlement in Ireland, the kind of enclosed farmstead often associated with the period between roughly the sixth and twelfth centuries, though dating any individual example without excavation is difficult. What is clear is that whoever compiled the 1837 survey thought it worth recording. Later editions of the same Ordnance Survey six-inch map series omitted it entirely, with no explanation given for the absence. The site was compiled and noted by Geraldine Stout, and uploaded to the record in August 2011.

There is nothing to see here now. The enclosure has been built over, and it is not visible at ground level. No earthwork survives, no depression in the ground, no trace that would signal anything to a passing walker. The value of knowing it existed lies not in visiting a place but in understanding how much of the early landscape of the Dublin coast has been absorbed into later development, leaving only the occasional ghost on an old map sheet to suggest what once organised the ground beneath our feet.