A rath, or ringfort, is a roughly circular enclosure defined by one or more earthen banks and ditches, and it was the standard form of rural settlement in early medieval Ireland, typically the homestead of a farming family of some standing. Ireland has an estimated 40,000 or more of them, yet each one occupies a specific patch of ground chosen by a specific household, for reasons of drainage, visibility, or social geography that we can only partially reconstruct.

Ballinglen is a small townland, and the ringfort there is one of countless such monuments that dot the Mayo countryside, many of them unexcavated and known mainly from field survey or aerial photography. Without excavation, it is rarely possible to say with certainty when a given rath was built or occupied, though the broad period runs from roughly the fifth to the twelfth century. Some raths were reused in later periods, incorporated into later field systems, or absorbed into folklore as fairy forts, a status that incidentally helped preserve many of them by discouraging interference. Whether this particular example carries any such local association is not recorded.