This circular structure, measuring approximately 15 metres across, appeared on the 1837 Ordnance Survey map as a distinctive double-ringed feature. Early 19th-century observers, including Colby in 1837, described it as a ‘tumulus’, suggesting it may have been a prehistoric burial mound, though its exact purpose remains uncertain.

The cairn met its demise sometime between the late 19th and early 20th centuries, disappearing from subsequent map editions and leaving barely a trace of its existence. When archaeologists surveyed the area in the 1980s, they discovered tantalising hints of what once was: the suggestion of a curving bank and a low scatter of broken stones, positioned midway between the inner and middle defensive banks of the hillfort, roughly where the 1837 map had marked it.

Today, visitors to this historic hilltop will find the area covered in heather, with no visible remains of the cairn that once stood here. Its destruction represents a common fate for many of Ireland’s ancient monuments during a period when their historical significance wasn’t fully appreciated. The site serves as a reminder of how much archaeological heritage has been lost over the centuries, leaving us to piece together the past from old maps, written accounts, and the faintest of physical traces.