These enclosures, known variously as raths or ringforts depending on their construction, were the basic unit of rural settlement in early medieval Ireland, roughly from the fifth to the twelfth centuries. A rath typically consists of one or more raised earthen banks, sometimes faced with stone, enclosing a roughly circular area where a farming family would have kept their home and sheltered their livestock. Tens of thousands of them survive across Ireland in varying states of preservation, and Kerry, with its mix of upland and lowland terrain, holds a considerable number.

The Glanlea example belongs to this widespread but still quietly compelling class of monument. The townland name itself, derived from the Irish, suggests a valley or glen landscape, the kind of sheltered ground that early farming communities tended to favour when choosing where to build and where to graze. Without more detailed excavation records or documentary sources, it is difficult to say more about who built this particular enclosure, when precisely it was constructed within the early medieval period, or what, if anything, was found within its banks. That gap in the record is itself a reminder of how many of these sites remain essentially unstudied at a detailed level, present in the landscape, mapped and classified, but not yet fully understood.