A lios is the Irish word for a ringfort, the type of enclosed farmstead that thousands of early medieval families built across Ireland, typically between the fifth and tenth centuries. The royal prefix attached to this one suggests it was never quite ordinary in local memory, even if the grassy banks that survive today give little immediate indication of anything regal.

The site sits on a south-south-east-facing slope in pasture, and its layout is more elaborate than most ringforts you might encounter. Where a typical example has a single bank and fosse, this one has three concentric earthen banks with two intervening fosses, a fosse being the ditch from which the upcast material was thrown up to form the bank beside it. The circular interior measures roughly thirty metres across, and the banks are not evenly spaced: to the north and south they spread apart by as much as eleven metres, giving the monument an irregular, almost organic quality rather than the neat geometry you might expect. The entrance, six metres wide at the inner bank, faces south-south-east, and the interior slopes gently downward in the same direction. To the south-west, the site has been clipped by a townland boundary, which has truncated part of the structure. What makes the location particularly interesting is its relationship to a possible early ecclesiastical enclosure immediately to the north, suggesting that whoever occupied or used this place may have existed in close proximity to an early religious community, the two sites perhaps sharing a landscape that was carefully divided between the sacred and the secular.