The example at Barnasrahy, in County Sligo, is a rath, the term used for a ringfort constructed primarily from earthworks rather than stone. A raised circular bank, sometimes accompanied by a fosse or outer ditch, would have enclosed a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. These were not defensive fortifications in any grand military sense but rather enclosed homesteads, markers of status and territory in a landscape organised around cattle, kinship, and seasonal rhythm.

Barnasrahy sits in a part of Sligo that has been settled for millennia, and the presence of a rath here points to the kind of quiet, persistent occupation that rarely makes it into written history. The people who built and used these enclosures left no documents, only the earthworks themselves, the gradual subsidence of banks, the faint circularity visible from above, the occasional scatter of finds turned up by a plough. The name Barnasrahy likely derives from Irish, as most townland names in Connacht do, though its precise meaning and etymology would require separate investigation into local placename records.