Known in Irish as a rath, this type of enclosure, typically a raised circular area bounded by one or more earthen banks and ditches, was the standard form of rural settlement across early medieval Ireland, in use roughly from the fifth to the twelfth centuries. Tens of thousands were built, and several thousand survive in varying states of preservation. That sheer number has, paradoxically, made it easy to overlook individual examples, particularly those in areas where the documentary record is thin.

Ringforts served as farmsteads for free farmers and their families, enclosing a home, outbuildings, and sometimes livestock. The bank and ditch were less about military defence than about marking a boundary, keeping animals in, and signalling status. In areas of County Mayo, where the terrain shifts between bog, drumlin, and coastal plain, these structures often survive because the land around them was too wet or too marginal to plough away. The Bruff example has not yet been the subject of published excavation or detailed field survey in any publicly available form, which leaves its date, condition, and original extent unconfirmed.