This one in Ballyan, County Limerick, offers something rather different: an absence. A ringfort, known in Irish as a rath, once occupied a quiet corner of a working farmyard here. A rath is a roughly circular enclosure, typically defined by an earthen bank and ditch, built during the early medieval period as a defended farmstead. They are among the most common monuments in the Irish landscape, numbering in the tens of thousands. This particular example, however, has effectively vanished.

The evidence for its existence comes from the 1923 Ordnance Survey six-inch map, which recorded an embanked circular enclosure with a diameter of approximately twenty metres on low-lying, gently undulating ground. That survey captured a monument that was, at the time, still legible in the landscape. Compiled by Denis Power and uploaded to the record in August 2011, the site notes are precise about what happened next: the farmyard was modernised and extended in the years following, and the monument is no longer evident. No dramatic event, no recorded excavation, no particular date of loss, simply the steady pressure of agricultural improvement doing what it has done to thousands of similar sites across the country.

There is little practical reason to seek this site out, and that is rather the point of noting it. The farmyard is private land, and there is nothing visible to a visitor even if access were granted. What the record preserves is the fact that something was here, pinned to a map made over a century ago. For anyone with an interest in how the early medieval Irish countryside was organised, or in how much of that organisation has quietly disappeared within living memory, the Ballyan rath is a useful, if sobering, case in point. The 1923 OS six-inch maps are freely available to consult online, and comparing them with modern satellite imagery of sites like this one can be a more instructive exercise than any standing monument.