Ringforts, which are roughly circular enclosures defined by earthen banks and ditches, were built primarily during the early medieval period in Ireland and served as defended farmsteads. The one at Sarue is no exception in form, but the presence of a possible lime kiln worked into its western bank suggests that later generations saw the old earthworks not as monuments to be preserved but as convenient ready-made structures to be adapted. Lime kilns were used to burn limestone at high temperatures, producing quicklime that could be slaked with water and spread on fields to reduce soil acidity, or mixed into mortar for building. Finding one built into a ringfort bank points to the kind of quiet, practical recycling of the landscape that was common in rural Ireland across the post-medieval centuries, where an ancient earthwork became, simply, a useful wall with good drainage and solid mass.