In a field at Ballyhomin in County Limerick, a ringfort once occupied a gentle south-westerly slope, its circular earthen bank enclosing a space of perhaps thirty metres across. Today, that same field is ordinary pasture, the ground unbroken and level, and there is nothing left to see.

A rath, to use the Irish term, is a ringfort defined by an earthen bank and ditch, typically dating from the early medieval period, roughly 500 to 1000 AD. They were the farmsteads of their time, enclosing a household and its outbuildings within a raised perimeter that offered both a degree of security and a visible mark of status in the landscape. The Ballyhomin example was recorded on the Ordnance Survey six-inch map of 1841, depicted as a circular embanked enclosure with a diameter of approximately thirty metres. That map record is now effectively the monument's only surviving form. When Denis Power compiled his inspection notes, uploaded in August 2011, he found no trace of the structure remaining. The monument had been levelled, most likely through agricultural improvement at some point after the Victorian surveyors recorded it.

The 1841 OS six-inch series is itself a remarkable document of a landscape in transition. Surveyed in the years before the Famine, it captured thousands of earthworks, field boundaries, and place names that would vanish in the decades that followed, either through land clearance, population collapse, or the slow attrition of tillage. Sites like this one appear on those sheets with quiet authority, given the same ink and attention as a road or a church, and it is sometimes only by returning to those original maps that the former presence of a monument can be confirmed at all. For anyone interested in this category of loss, the 1841 sheet covering Ballyhomin remains the primary document worth consulting. The field itself, on a south-west facing slope somewhere beneath the Limerick sky, holds no visible clue that anything was ever there.