The one at Ballybeg in County Kerry is a case in point: a rath, as this type of earthwork enclosure is known in Irish, typically consisting of one or more circular earthen banks and ditches that once enclosed a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. These were not fortresses in any military sense but the defended homesteads of farming families, the bank and ditch serving to keep livestock in and wolves or rival neighbours out.

Raths of this kind were once so numerous across Kerry that they formed a kind of invisible geometry across the farmed landscape, each one representing a household, a family's claim on land, and a way of organising rural life that persisted for centuries. The place name Ballybeg itself, derived from the Irish Baile Beag meaning small townland or small settlement, hints at the modest, workaday character of the place. It is the sort of name that turns up repeatedly across Ireland, attached to corners of the country that were always inhabited but never especially prominent, which is precisely what makes the presence of a ringfort here so quietly legible as history. Someone farmed this ground over a thousand years ago, drew a circle in the earth around their home, and left a mark that outlasted everything else they built.