These distinctive earthworks, characterised by their rectangular platforms surrounded by water-filled ditches, were far more common than stone castles during the medieval period, yet most have vanished from the landscape or survive only as subtle earthen remains visible to the trained eye.

This particular site would have consisted of a raised platform, typically measuring between 40 and 60 metres square, encircled by a deep moat that served both defensive and drainage purposes in what was often marshy ground. The platform would have supported timber-framed buildings; perhaps a hall house for the lord’s family, along with various outbuildings for storage, livestock, and servants’ quarters. The moat, usually between 5 and 15 metres wide, was crossed by a wooden bridge or causeway that could be raised or destroyed in times of conflict.

Archaeological evidence from similar sites across Leinster suggests these moated settlements flourished during the initial decades of Anglo-Norman expansion but gradually fell out of use by the 15th century, as stone tower houses became the preferred form of fortified dwelling. Today, Ballytarsna’s moated site survives as a grass-covered earthwork, its rectangular form still clearly defined despite centuries of agricultural activity. These sites offer valuable insights into the everyday lives of medieval settlers who existed somewhere between the great lords in their stone castles and the native Irish population in their undefended farmsteads.