That near-perfect squareness is quietly unusual. Most early medieval domestic structures found within raths tend toward the circular, following a building tradition that dominated Irish rural life for centuries, so a square footprint of this kind merits a second look.

A rath, sometimes called a ringfort, is a type of enclosed farmstead typically dating from the early medieval period, roughly the sixth to the twelfth century. They are among the most common archaeological monument types in Ireland, yet each interior tells a slightly different story about how people organised their domestic space. The enclosing earthwork at Cullomane contains this small square structure, its modest dimensions suggesting a subsidiary building rather than a principal dwelling, perhaps a store, a workshop, or a shelter for animals. At just under three metres across, it would have been a compact space by any reckoning.