Fairy forts of Ireland, mapped

What is a fairy fort?

A fairy fort is a ringfort: the circular, banked-and-ditched enclosure of an early medieval Irish farmstead, raised for the most part between roughly 500 and 900 AD to shelter a household and its cattle. The earthen kind is a ráth, anglicised rath; the stone kind, built where stone was plentiful and timber scarce, is a caiseal, anglicised cashel. Ringforts are the most common field monument on the island, and this dataset records 31,386 of them.

Long after the farms were abandoned, the grass-grown banks kept their hold on the imagination. Folk tradition read them as dwellings of the Sídhe, the Good People, and held that to plough, level, or cut the thorn trees growing on a fort invited illness, ruin, or worse. That prohibition, more than any statute, is why so many still stand: ringforts were routinely ploughed out elsewhere in Europe, while in Ireland tens of thousands were left untouched. The belief acted, in effect, as heritage protection.

Read the full entry on fairy forts, with its sources and the recorded consequence stories.