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. They were the homes of farming families, places of daily life rather than military strongholds, and Ireland has tens of thousands of them, each one a faint signature of a particular household that worked a particular patch of ground.

The ringfort at Creggaun is one of those sites where the documentary record currently offers little to work with. What can be said with confidence is that the townland name itself, Creggaun, derives from the Irish creagán, meaning a small rocky place or rocky ground, a descriptor that fits much of this part of Mayo and gives some sense of the terrain these early farmers would have negotiated. The monument belongs to a class of site that was in active use roughly between the fifth and twelfth centuries, though many raths were built on earlier ground and continued to carry meaning long after they fell out of domestic use, accumulating associations with the supernatural in local tradition.