Knocknarea megalthic site, Sligo

The cairn on Knocknarea dates to approximately 3000 to 3500 BC and sits at the center of a Neolithic ritual landscape that includes Carrowmore and Carrowkeel. The mountain's association with Queen Medb of Connacht, a sovereignty goddess of the Iron Age Ulster Cycle, added mythological power to a site already ancient by the time her stories were told.

In Irish mythology, Queen Medb of Connacht is the fierce warrior queen who launched the Tain Bo Cuailnge, the great cattle raid against Ulster, seeking the brown bull of Cooley to match her husband Ailill's white bull and thereby demonstrate her equality. She took lovers as she chose, required that any king of Connacht submit to symbolic union with her to claim sovereignty, and ruled with a force that the stories never domesticate or apologize for.

She is said to be buried upright in the great cairn on Knocknarea, facing north toward Ulster, still at war in death as in life. The cairn has never been opened, and the tradition holds that this is at least partly because people fear what they might find, or unleash.

Scholars understand Medb as a euhemerized sovereignty goddess, her name meaning 'she who intoxicates,' cognate with 'mead.' Her many sexual partners and her requirement that kings mate with her before ruling are consistent with the sovereignty goddess pattern found across Celtic mythology. The cairn that bears her name predates the Iron Age stories by at least two thousand years, but the layering of mythology upon Neolithic reality created something more powerful than either alone.

The Neolithic builders chose Knocknarea for reasons that archaeology has begun to illuminate. The University of Galway's Knocknarea Archaeological Project documented extensive settlement evidence on the mountain, suggesting it was not merely a burial site but a living center of ceremonial and domestic activity over centuries.