Fort, Lisacullion, Co. Monaghan

Drumlins, the smooth oval hills formed by retreating glaciers at the end of the last Ice Age, were favoured sites for ringforts throughout early medieval Ireland, offering natural elevation and clear sightlines without the labour of levelling ground. This one at Lisacullion is modest in scale, roughly 27 metres across, but its proportions are consistent with the earthen ringforts, sometimes called raths, that served as enclosed farmsteads for local farming families across early Christian Ireland.

The enclosure is defined by a single earthen bank, its base running between 4.5 and 4.8 metres wide. The bank survives to an internal height of around one metre, though on the outer face it rises more substantially, reaching two metres at the south-east. That variation in height reflects both the natural slope of the drumlin and the accumulated effect of centuries of weathering and vegetation. A shallow fosse, the external ditch that would originally have reinforced the defensive appearance of the bank, is still faintly traceable on the south-east side, though it has largely silted and softened over time. The entrance, just over three metres wide at its base, faces south, a common orientation for sites of this type and one that maximises light and shelter. The interior is now open grassland with scrub encroachment, giving little visible indication of whatever structures once occupied the space within.