Tuatha de Danaan (tribe of Danu), in Irish myth, the descendants of the goddess Danu.  They invaded Ireland from a magic cloud and drove the aboriginal Firbolgs into Connaught, taking for themselves the richest provices in the island.  They were a beautiful race, highly skilled as smiths, artisans and physicians, and as poets and magicians.  In their turn the Danaans were conquered by the Sons of Miled (Milesians), and withdrew into the realm of faery, where they still reside in immortal bliss.  There are stories which tell how mortals are sometimes taken to this enchanted land, where they live for years, which pass like a single night. (Heroes and Heroines of Fiction, Walsh, 1914)