On the eastern side of a stream valley in Coollicka, County Cork, a ringfort once stood in open pasture. Today there is no earthwork to see, no raised ground, no shadow in the grass after rain. The surrounding field fences have gone too, so even the boundaries that once framed the site have been erased.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically defined by one or more circular earthen banks and ditches. They were the most common form of rural settlement in Ireland between roughly the fifth and twelfth centuries, and several thousand survive in various states of preservation. The one at Coollicka was never elaborate: a single rampart enclosing a roughly circular space of about thirty metres across, or eighty feet in the older measurement recorded by Hartnett in 1939, who noted at that time that it was already almost entirely demolished. The Ordnance Survey had mapped it clearly in 1842, showing it as a hachured circular enclosure on the six-inch sheet, but by the time the same mapping was revised in 1904 it was already partially levelled, a process that had continued by the 1939 revision as well. The decades between those surveys tell the quiet story of agricultural improvement steadily reclaiming the ground.