A rath, or ringfort, is a roughly circular enclosure defined by one or more earthen banks and ditches, built predominantly during the early medieval period, roughly between the fifth and twelfth centuries. They served as farmsteads and family enclosures, and Ireland once held tens of thousands of them. Flemby's example is among the many that persist without much accompanying documentation, known to exist but not yet fully described.

Ringforts of this kind are among the most common archaeological monument types in Ireland, yet each one carries its own particular history shaped by the family or farming community that built and used it. Kerry, with its mix of upland pasture and sheltered lowland, contains a significant number of such sites, many of which have survived because they were left undisturbed in fields, their banks too awkward to plough away entirely. Without further specific records available for Flemby, the broader pattern tells us that these enclosures were typically home to a single extended family of free farming status in Gaelic society, their bank and fosse providing a degree of protection for livestock as much as for people.