Where the more familiar rath was raised from mounded soil and ditches, a cashel was constructed in stone, its circular enclosure reflecting both the available local material and the enduring preference, across early medieval Ireland, for a fortified farmstead that could house a family, their livestock, and whatever modest status they held in the tuath, the local territorial unit. The cashel at Ballymurphy belongs to a broad class of monument found throughout Ireland but concentrated in areas where surface stone is plentiful, and Clare, with its limestone-rich landscape, provided ready material for builders working sometime between roughly the fifth and twelfth centuries.

Beyond its classification and location, the documentary record for this particular site is presently thin. What can be said is that cashels of this kind typically served as the enclosed farmsteads of free landholders or minor lords, the enclosing wall offering a degree of protection for animals as much as for people. Clare's archaeology is dense with such sites, many of them surviving as overgrown rings in improved farmland, their walls robbed for field boundaries or simply absorbed into the landscape over centuries of agricultural use. The cashel at Ballymurphy takes its place in that long, largely unchronicled company.