The Ordnance Survey six-inch maps, compiled in the nineteenth century, recorded it clearly enough: a circular enclosure roughly forty metres in diameter, the kind of dimensions typical of an early medieval rath. A rath is a ringfort defined by one or more earthen banks and ditches, built as a defended farmstead during the first millennium AD, and thousands of them once punctuated the Irish landscape. This one, however, has left no visible surface trace. The banks are gone, the ditches levelled, and the field carries on as ordinary grassland with no apparent memory of what once stood there.