That name alone is enough to pause on. Townland names in Ireland are frequently anglicised remnants of older Irish placenames, and Rubble may well reflect a landscape long associated with broken stone or rough ground, the kind of terrain where a rath would not look out of place.

A rath is a ringfort, typically an enclosed circular area defined by one or more earthen banks and ditches, built during the early medieval period, roughly between the fifth and twelfth centuries. These were domestic settlements, farmsteads of the period, and Ireland still contains tens of thousands of them in varying states of survival. The one at Rubble is recorded as a monument, which means it has been formally identified and assigned protected status, though the details of its current condition, dimensions, and any associated features remain undocumented in publicly available sources.