At the southern end of a gentle rise in well-drained pasture at Carrickedmond in County Longford, a circular earthwork survives as little more than a whisper in the landscape, its bank reduced to a scarp barely twenty centimetres high. Walk the full circuit and you trace an enclosure roughly fifty metres across, a circumference that holds its shape only because the eye is willing to follow the faint line where the ground drops almost imperceptibly away.

This is almost certainly the remains of a rath, the most common type of early medieval settlement monument in Ireland. A rath was typically a farmstead of the period between roughly the fifth and twelfth centuries, defined by one or more earthen banks and external ditches enclosing a circular area where a family would have kept their house, their livestock, and their stores. Thousands survive across Ireland in various states of preservation; many more have been ploughed or built over entirely. The one at Carrickedmond sits somewhere between those two conditions, largely levelled by centuries of agricultural activity but not quite erased, its circular outline still readable to anyone who knows what to look for in the slight undulation of a pasture field.