At Kilmoreen in County Limerick, a ringfort, or rath, was carefully recorded on the 1923 Ordnance Survey six-inch map as an embanked circular enclosure roughly twenty metres in diameter, sitting on an east-facing slope just below the top of a ridge. By the time anyone came looking in earnest, it was gone. Not collapsed, not overgrown, but levelled, with no trace remaining on the ground whatsoever.

Ringforts are among the most common early medieval monuments in Ireland, earthwork enclosures typically built between around 500 and 1000 AD, used as farmsteads and defined by one or more circular banks and ditches. Thousands survive across the country in varying states of preservation. The one at Kilmoreen was modest by most measures, at twenty metres across sitting toward the smaller end of the scale, but it was real enough in 1923 for a surveyor to plot its outline with care. What happened in the intervening decades is not recorded. Agricultural improvement, field drainage, and the gradual pressure to bring every square metre of land into productive use have accounted for a great many such sites across Limerick and beyond. When Denis Power compiled the record and uploaded it in August 2011, the finding was unambiguous: monument depicted, monument absent.

The site lies in pasture on an east-facing slope, which is worth knowing if you happen to be in the area, though there is nothing on the ground to reward a visit in the conventional sense. The ridge setting, common for ringforts, would once have offered good visibility and decent drainage, practical reasons for choosing a spot that a farmer centuries later might have found equally practical to clear. The 1923 map remains the closest thing to evidence that something was here at all, a circle of ink standing in for a circle of earth that no longer exists.