The example at Gorteens in County Mayo is one such site, a rath, which is the Irish term for a roughly circular earthwork enclosure, typically formed by one or more banks and ditches, that served as a farmstead or defended homestead during the early medieval period, roughly between the fifth and twelfth centuries. These were not military fortifications in any grand sense, but the everyday domestic spaces of farming families, places where livestock were penned, houses built, and lives organised around the rhythms of an agricultural year.

Raths of this kind were constructed by digging a circular ditch and piling the extracted earth inward to form a raised bank, sometimes reinforced with timber palisading or stone. The interiors could hold timber or stone buildings, souterrains (underground stone-lined passages, likely used for storage or refuge), and evidence of metalworking or other craft activity. In Mayo, a county whose landscape still holds a remarkable density of early medieval remains, sites like the one at Gorteens are embedded in a wider pattern of settlement that stretched across the province during the first millennium. The specific history of this particular enclosure, its dimensions, its condition, any finds associated with it, remains undocumented in the public record for now.