Known as Lissalon, or in Irish Lios a Lóin, meaning fort of the blackbird, it was recorded on Ordnance Survey maps of 1841 to 1842 as a circular enclosure, the standard form of a rath, a type of earthwork ringfort typically used as a defended farmstead during the early medieval period. Even then, a road running north to south had already clipped its western edge. By the time the OS revisited the area for the 1939 edition, the outline was still cartographically present. Today, no surface trace of the site survives at all.

The name alone is worth pausing over. Lios a Lóin suggests either a place genuinely associated with blackbirds or, as was common in early Irish place-naming, a person whose nickname connected them to the bird. Either way, the name was old enough and recognisable enough to be recorded faithfully by nineteenth-century surveyors who were systematically gathering Irish townland names across the country. The enclosure they noted was a circular one, consistent with the thousands of raths that once dotted the Irish countryside, most of them dating from roughly the sixth to the twelfth centuries. The gradual removal of this particular example, accelerated by road-building and subsequent land use, left nothing visible for later generations to find.