Invisible at ground level, buried beneath pasture and surrounded by rushes, it leaves no trace on the surface of the land that an ordinary visitor could read. A ringfort, or rath, is a roughly circular enclosure, usually defined by an earthen bank and ditch, that served as a farmstead during the early medieval period in Ireland. Thousands survive across the country, and many are immediately recognisable in the landscape. This one is not.

What we know of it comes largely from cartographic evidence. The first edition of the Ordnance Survey six-inch map, produced in 1837, recorded the site as a circular enclosure, preserving in ink what the land itself no longer shows. The fort sits on a natural ridge, a slight elevation that would have made it a practical and defensible position for whoever farmed there over a thousand years ago. That ridge now lies quietly between the northern bank of the River Inny and the southern bank of the Royal Canal, a waterway constructed in the late eighteenth and early nineteenth centuries to link Dublin with the Shannon. The canal, in other words, is a relative newcomer to a landscape that had already been occupied and shaped long before its builders arrived.