Randoon (Randún), possibly the most famous fort of the area, is between Castlepollard and Collinstown.

Ringforts are fortified settlements, generally agreed to be from the Early Medieval Period in Northern Europe, especially Ireland.

They are also known as ráth (as in Ranaghan) caiseal, cathair and dún (as in Randoon/Randún) in the early Irish sources.

A dún is a more prestigious site, the seat of a local chieftain or ruler; the term is also applied to promontory forts.

No historical or archaeological maps, surveys, nor records of the Early Medieval Period in Ireland approach the dates of the Irish ringforts.