A cashel is simply a ringfort built from stone rather than earth and timber, the word deriving from the Latin castellum, and in the limestone-rich terrain of Clare such structures were a practical as much as a defensive choice. Where farmers in other parts of Ireland raised circular earthen banks around their homesteads, those in rocky Connacht and Munster stacked what the ground gave them.

Ringforts of all kinds, whether earthen raths or stone cashels, were the dominant settlement form in Ireland between roughly the fifth and twelfth centuries. They functioned primarily as enclosed farmsteads, protecting a family's livestock from raiders and wolves rather than serving any grand military purpose. Thousands survive across the country in varying states of preservation, and Clare, with its thin soils and abundant field stone, has a particular density of the stone-built variety. The place name Poulgorm itself is worth a moment's pause. In Irish, poll gorm can mean blue hole or blue pool, suggesting that water, perhaps a spring or a dark limestone hollow, once gave this townland its identity as much as any ancient enclosure did. The cashel and the place name together speak to a landscape that has been continuously read, named, and worked for well over a thousand years.