The placename alone is suggestive: O'Brien is one of the most prominent dynasties in Irish medieval history, the family that produced Brian Boru and dominated Munster and Thomond for centuries. An earthwork associated with such a name could be a ringfort, a raised enclosure, a defensive bank, or the remnant of a much larger complex of structures. The fact that it survives as a recorded monument means someone, at some point, judged it significant enough to mark and protect.

Beyond the placename and the monument's existence as a classified earthwork, the specific details of this site remain elusive for now. Earthworks, as a broad category, cover a wide range of man-made landscape features constructed from shaped earth, including ring forts, enclosures, and field boundaries, many of which date to the early medieval period in Ireland. The O'Brien connection in Clare is historically deep: the family held sway across this part of Munster from at least the tenth century, and the landscape of Clare is scattered with the physical traces of their power. Whether this particular earthwork is directly associated with that dynasty or simply preserves their name through centuries of local usage is, for now, an open question.