Rathmore, meaning "great fort" in Irish, is a placename attached to dozens of sites across the country, each one marking a spot where someone, at some point, built something intended to endure. The example at Gortnahurra in County Mayo belongs to this family of monuments, a rath being a roughly circular earthen enclosure used in early medieval Ireland, typically as a defended farmstead or seat of local authority. They are the most common archaeological monument type in the Irish landscape, yet each one occupies its own particular ground, shaped by local topography and the decisions of people whose names are now long lost.

Gortnahurra is a townland in Mayo, and the presence of a rathmore there suggests a site of some local significance. The "more" suffix implies scale or status above the ordinary, distinguishing this enclosure from the smaller, more numerous examples scattered across the countryside. Beyond that, the documentary record for this particular site is thin, and what fieldwork or survey has been carried out has not yet been fully published or made widely accessible. The archaeology of Mayo's interior contains many such gaps, places that have been noted and classified but not yet subjected to the kind of detailed examination that would allow a fuller account of who built here, when, and why.