These enclosures, known in Irish as ráth when built from earthen banks and ditches, were the standard farmstead of early medieval Ireland, roughly from the fifth to the twelfth century. Tens of thousands of them once existed across the country; several thousand survive in varying states of preservation. The one at Ballynagun is among the less documented examples, its particulars not yet fully recorded in publicly accessible form.

What can be said with confidence is that it belongs to a class of monument that shaped the Irish countryside as profoundly as any later architecture. A typical rath consisted of one or more circular earthen banks enclosing a central area where a family and their livestock would have sheltered, farmed, and conducted the business of daily life. Clare is particularly well supplied with such sites, reflecting both the density of early medieval settlement in the region and the relative survival of earthworks in areas that escaped intensive modern agriculture. Ballynagun itself is a small townland, and like many such places its name carries layers of older geography that predate any written record of its inhabitants.