Celtic mythology, as preserved in Irish tradition, centers on the Tuatha Dé Danann — a supernatural race descended from the mother goddess Danu. They arrived in Ireland wrapped in mist, bringing four magical treasures and mastery over druidry, smithcraft, and poetry.
At their head stood the Dagda, the "good god" whose club could kill and revive, and Nuada of the Silver Hand, their first king. Warriors like the radiant Lugh and fearsome goddesses such as the Morrigan shaped the fate of battles against the monstrous Fomorians.
When later peoples conquered Ireland, the Tuatha Dé Danann were said to retreat into the hollow hills, becoming the aos sí — the fairy folk of Irish legend.
