These enclosures, known in Irish as raths, were the farmsteads of early medieval Ireland, typically consisting of a raised circular area defined by one or more earthen banks and ditches. They were not primarily military structures, despite the fortress in the name, but rather the enclosed homesteads of farming families, used to pen livestock and mark out territory in a period when such boundaries carried real social weight. Clare has hundreds of them, and each one represents a particular patch of ground that someone, at some point between roughly the fifth and twelfth centuries, decided was worth enclosing and defending.

The ringfort at Cullenagh belongs to this widespread but still poorly understood tradition. Raths of this kind are among the most common archaeological monument types in Ireland, with estimates suggesting somewhere between 40,000 and 50,000 once existed across the island. Their survival into the present is often a matter of luck, local memory, or the stubborn resistance of a grass-covered bank to the plough. In Clare, the karst landscape and the patterns of land use have preserved a good number of them, and the townland of Cullenagh sits within a county whose archaeological record remains one of the most varied in the country.