A rath, as this type of ringfort is known in Irish, is a roughly circular enclosure defined by one or more earthen banks and ditches. These were the farmsteads of early medieval Ireland, home to a family of some local standing, their livestock kept safe within the bank at night. Tens of thousands once existed across the island; several thousand survive in recognisable form. The one at Mullaghmarky is among them, though detailed records about its condition, dimensions, and precise form remain sparse.

The ringfort as a settlement type flourished broadly between the fifth and twelfth centuries, though some examples were built earlier and others continued in use or were adapted long after that period. The name Mullaghmarky is itself suggestive of the landscape: the element "mullagh" derives from the Irish "mullach", meaning a summit or hilltop, which is consistent with the pattern of siting raths on elevated or gently raised ground where drainage was better and visibility useful. Beyond that topographical hint, the documentary record for this particular site is thin, and the archaeology has not yet been fully described in any publicly available form.