Tuatha Dé Danann
The Tuatha Dé Danann ('People of the Goddess Danu') are the pre-Christian divine race of Irish mythology, arriving with four treasures. They defeated the Fir Bolg and Fomorians, then withdrew into sídhe mounds when the Milesians invaded. Key figures: the Dagda, Lugh, the Morrígan, Brigid, Nuada, Manannán mac Lir. Documented in Lebor Gabála Érenn and the Mythological Cycle.