The site is called Lisnapeastia, from the Irish Lios na Péiste, meaning the ringfort of the serpent, and it is the kind of place that survives now only in old maps and older scholarship. A ringfort, to give the briefest context, is a circular enclosure typically defined by an earthen bank and ditch, used as a farmstead or defended homestead in early medieval Ireland. This particular one was ploughed out entirely during the 1980s, and no surface trace of it remains today.

The antiquary Thomas Johnson Westropp, writing in 1909, described Lisnapeastia as a large low fort, which suggests it was already less prominent than many comparable sites even before it disappeared. It appeared on Ordnance Survey maps made between 1841 and 1842, and again on the revised edition of 1914 to 1915, marked each time as a circular enclosure. That consistency across two surveys separated by more than seventy years tells you it was a legible, recognisable feature in the landscape for well over a century. The name itself is the most durable thing about it now, carrying the trace of some association with serpents or perhaps with a legendary creature, though what that association actually was is no longer recorded.

There is nothing to see at Gullane today that would mark the spot. The field has been farmed over, the earthworks are gone, and the site belongs now to the category of places that are more interesting as absences than as presences.