It is a rath, the Irish term for a ringfort, and structures like it were once among the most common features of the Irish countryside. Estimates suggest there were once around 50,000 of them scattered across the island, built primarily during the early medieval period, roughly between the fifth and twelfth centuries. A rath typically consisted of a roughly circular area enclosed by one or more earthen banks and ditches, serving as a defended farmstead for a family of some social standing. They are so numerous, and so quietly embedded in field systems and hedgerows, that encountering one can feel less like a discovery than a gradual recognition.

The Fieries rath belongs to a county exceptionally well supplied with such monuments. Kerry's relatively low levels of intensive arable farming have allowed many earthworks to survive where they might otherwise have been levelled. Raths in this part of Ireland are associated in local tradition with the sídhe, the supernatural inhabitants of the otherworld, and it was considered deeply unwise to disturb them. That folklore almost certainly helped preserve many sites that agricultural pragmatism might otherwise have claimed. The specific history of this particular enclosure, its date of construction, the family or community it sheltered, and any finds associated with it, remain undocumented in any publicly available form at present.

For anyone passing through the Fieries area with an eye for earthworks, the thing to look for is the characteristic low, rounded bank, often partly absorbed into a field boundary or overgrown with scrub and mature trees. Raths frequently appear as slightly raised circular platforms, their original ditches softened by centuries of silting and ploughing at the margins. The surrounding farmland near Fieries is quiet and largely pastoral, which makes careful observation of field patterns worthwhile. What survives above ground may be modest, but the form itself, that deliberate circle imposed on an Irish hillside more than a thousand years ago, carries its own particular weight.