A rath, as this type of monument is also known, is an enclosed farmstead of the early medieval period, typically defined by one or more circular earthen banks and ditches. Tens of thousands of them survive across Ireland, yet each one marks a spot where a family once lived, farmed, and organised their world within a boundary that was as much social as it was defensive.

The townland name Pollnagawna hints at the kind of layered Gaelic geography that tends to accumulate around sites of long settlement, though the specific history of this particular enclosure, its construction date, who built it, and what survives of its earthworks, remains poorly documented in the public record. Mayo is densely scattered with such monuments, many of them sitting in rough grazing land or tucked against field boundaries that were themselves shaped around them over subsequent centuries, farmers working the land and leaving the old circular mounds well enough alone out of habit, superstition, or simple practicality.