Ringforts, known in Irish as raths, are among the most common archaeological monument types in Ireland, with tens of thousands recorded across the country. They were typically built during the early medieval period, roughly between the fifth and twelfth centuries, and served as enclosed farmsteads, their banks and ditches marking out domestic space and offering a degree of protection for people and livestock. That so many survive at all is partly due to a long-standing folk belief that disturbing them brings bad luck, a superstition that, whatever its origins, has proven more effective than many a planning regulation.

The Barnasrahy example carries the designation rath, referring to an earthen-banked enclosure as distinct from a cashel, which would have been built from stone. Beyond its location in this corner of Sligo, the specific details of this particular site remain largely undocumented in any publicly accessible form. What can be said is that the townland name itself, Barnasrahy, derives from the Irish, and that this part of Sligo sits within a region that has been continuously inhabited since prehistory, its fields and bogs preserving layer upon layer of human activity beneath and alongside the visible surface.