A cashel is simply the stone equivalent of the more familiar earthen ringfort, a roughly circular enclosure built to protect a farmstead and its inhabitants, livestock included. Where earthen raths were raised from soil and sod, cashels were constructed from dry-stone walling, a technique well suited to the limestone-rich terrain of counties like Clare, where suitable earth is scarce but flat grey stone is anything but.

Ringforts, whether built from earth or stone, were the dominant settlement type in early medieval Ireland, broadly spanning the period from around the fifth to the twelfth century. Thousands survive across the country in varying states of preservation, some dramatically intact, others reduced to a faint circular crop mark visible only from the air. The cashel at Poulbaun belongs to this wider pattern of rural enclosures that once defined the Irish countryside, each one the centre of a small farming household, a chieftain's seat, or something in between. Clare, with its Burren karst to the north and its patchwork of drumlin and bogland elsewhere, retains a notable concentration of such monuments, many of them still unexcavated and understood only in outline.

Beyond its classification and location, the specific history of this particular cashel, its dimensions, its condition, any finds or features associated with it, remains undocumented in the public record at present. What can be said is that Poulbaun itself is a small and unassuming townland, and the monument it contains is the kind of place that rewards a slow walk and a careful eye rather than a signposted visit.