During excavations carried out by Knox in 1915 and 1916, a small cist was uncovered within a cutting through the western side of the bank, positioned at a level that appears to predate the bank's construction. A cist, in this context, is a simple stone-lined burial box, typically prehistoric, formed by setting upright slabs around a body or cremation deposit. This particular example was a modest affair: two thin stones on each long side, one closing slab at each end, and three flat stones laid across the top.

Inside the cist, excavators found fragmentary traces of cremated bone. The remains were slight, the structure rudimentary, but the find carries considerable archaeological weight. It suggests that the ground at Feewore was already a meaningful place, perhaps already associated with the dead, before the ringfort was raised over and around it. This kind of stratigraphic relationship, where a later monument is built atop an earlier burial, is not unheard of in Ireland, though it is rarely so clearly demonstrated. The discovery was later discussed by Waddell in 1975, situating it within the broader landscape of prehistoric funerary practice in the region.