The ground sloped. So they raised the southern interior, levelling it artificially to create a usable platform within the earthwork. It is a small detail, but it speaks to the pragmatic intelligence of early medieval construction in a way that a more dramatic monument might not.

The site is a rath, the Irish term for an earthen ringfort, the most common monument type in the Irish landscape. Tens of thousands were built, predominantly between roughly the fifth and twelfth centuries, serving as enclosed farmsteads for single family groups. This example at Lisbehegh is a tidy specimen of the form: a circular area of 34 metres across in both directions, enclosed by an earthen bank still standing about two metres high on its inner face, with a fosse, or external ditch, running around it at roughly a metre deep. The entrance is a gap of just over three metres on the south-south-east side, reached by a causeway across the fosse, which would have been the only intended way in or out. The combination of bank, ditch, and single controlled entrance gave the enclosure both a physical and a psychological boundary, separating the domestic space within from the open land without.