The rath at Aghaconny is something more deliberate than that. Two substantial earthen banks ring a raised circular interior of around forty metres in diameter, each bank paired with its own outer fosse, and a berm, a flat strip of ground, separates the outer bank from the inner ditch. The effect is a concentric set of obstacles that would have made the enclosure considerably more formidable than the average early medieval homestead.

Ringforts, known in Irish as raths when earthen, were the predominant settlement form in Ireland roughly between the fifth and twelfth centuries, serving as enclosed farmsteads for families of varying social rank. The number of defensive elements tends to reflect that rank, and a bivallate example, one with two banks and ditches, generally signals a household of some consequence. The original entrance to this particular fort survives as a pair of corresponding gaps in the two banks on the southern side, complete with the remains of a causeway crossing the ditches. That the causeway is still partially legible is a small detail worth pausing on; it marks the exact threshold where people once passed in and out of a functioning settlement, a point of contact between the enclosed world of the rath and whatever lay beyond it.