The date is unknown. The structure sits within an enclosure that has been quietly minding its own business in Cloghaneleesh, County Kerry, for a very long time, its origins unrecorded and its occupants unnamed.

The enclosure itself is a univallate ringfort, meaning it has a single line of defence: one earthen bank and a fosse, the exterior ditch that once made the bank appear even more formidable. Ringforts of this kind were the dominant form of rural settlement in early medieval Ireland, typically associated with farming families of some local standing, though the term fort overstates their military character. Lisnamuck follows the expected form closely. Its enclosing bank runs about six metres wide, rises between 1.2 and 2.4 metres on the outside, and stands rather lower on the interior side, a feature explained by the fact that the ground within the enclosure sits higher than the surrounding land. What makes Lisnamuck slightly more arresting than many such sites is the stone house-site preserved inside it. Rectangular in plan and measuring fourteen metres by six and a half metres internally, with those unusually substantial two-metre walls, the structure hints at a building that was meant to last. Whether it dates to the same period as the ringfort itself, or represents a later use of a ready-made enclosure, is not recorded. C. Toal's North Kerry Archaeological Survey, published in 1995, documented the site without resolving that question.