This is a rath, the Irish term for a ringfort, the kind of enclosed farmstead that thousands of early medieval families across Ireland built between roughly the fifth and twelfth centuries. Most consisted of a roughly circular area of raised ground surrounded by one or more earthen banks and ditches, providing a defended space for a household and its livestock. This particular example, measuring about 45.5 metres east to west and 42.5 metres north to south, has been levelled to the point where only a slight scarp defines its northern arc, and a faint external depression hints at where the original ditch once ran to the west and north-west.

The ringfort was already visible on the Ordnance Survey six-inch map of 1842, where it appears as a hachured circular enclosure, the short radiating lines surveyors used to indicate an earthwork rising from the surrounding ground. By the time later editions of the map were produced in 1905 and 1936, the enclosure itself had been largely absorbed into the field system, though a curved field boundary following the south-west to north-east arc of the original bank still traced its outline. That a boundary persisted for nearly a century after the main earthwork had gone is not unusual; farmers often found it practical to preserve the line of an old bank as a convenient division, even when the bank itself had been reduced to nothing. One small engineering detail survives as evidence of original construction: the interior has been deliberately raised on its eastern side to create a level platform despite the natural fall of the hillslope, a modest but telling sign of the care that went into laying out a working farmstead on sloping ground.