Tens of thousands of them were built across the island between roughly the fifth and twelfth centuries, serving as farmsteads for local farming families, their livestock, and sometimes their dead. The earthen banks that define them, raised by generations of labour and left largely untouched for a millennium, are quiet enough presences in a field that a passing eye might mistake them for a natural rise in the ground.

Ringforts of this kind were the basic unit of early medieval Irish settlement, built by raising a circular rampart of earth, sometimes reinforced with stone, around a central living area. The enclosure offered protection against opportunistic cattle raids as much as anything organised, and the interior would have held timber or wicker structures, storage pits, and hearths. Mayo has a substantial concentration of surviving examples, many of them in townlands that have changed little in outline since those enclosures were first thrown up. The specific history of the Mountgregory example, its date of construction, the family or community that occupied it, and the precise condition of what survives, remains to be fully documented.

What can be said is that the rath exists as a listed monument, recognised under Irish heritage legislation, which affords it a degree of legal protection regardless of land use. For anyone with a particular research interest in early medieval settlement in the west of Ireland, the site sits within a county that rewards careful, unhurried attention to the ordinary field boundaries and subtle earthworks that most roads simply pass by.