A rath, or ringfort, is a roughly circular enclosure defined by one or more earthen banks and ditches, built during the early medieval period, roughly between the fifth and twelfth centuries, as a farmstead or residence for a family of some local standing. Ireland contains thousands of them, scattered across nearly every county, and yet each one occupies a particular patch of ground with its own relationship to the surrounding fields, slopes, and hedgerows. The one at Glen is among the quieter entries in the archaeological record.

Ringforts of this type were the dominant form of rural settlement in early medieval Ireland. The bank and ditch served less as a serious military defence and more as a boundary marker and a means of enclosing livestock overnight against wolves and opportunistic theft. Inside, a family would have kept their house, outbuildings, and perhaps a souterrain, an underground stone-lined passage used for storage or refuge. The specific history of the Glen example, including its dimensions, condition, and any finds associated with it, remains undocumented in publicly available form at present, which places it in a curious category: a monument that is known to exist and is recorded, but whose particulars have yet to be written up for general access.