The Tuatha Dé Danann ("peoples of the goddess Danu", pronounced /tu�?ˈəhə dʲɛ�? danˈən) are a race of people in Irish mythology. In the invasions tradition which begins with the Lebor Gabála Érenn, they are the fifth group to settle Ireland, conquering the island from the Fir Bolg.
They are thought to derive from the pre-Christian gods of Ireland. When the surviving stories were written, Ireland had been Christian for centuries, and the Tuatha Dé were represented as mortal kings and heroes of the distant past, but there are many clues to their former divine status. A poem in the Book of Leinster lists many of the Tuatha Dé, but ends "Although the author enumerates them, he does not worship them." Goibniu, Creidhne and Luchta are referred to as Trí Dé Dána ("three gods of craftsmanship"), and the Dagda's name is interpreted in medieval texts as "the good god." Even after they are displaced as the rulers of Ireland, characters such as Lugh, the Morrígan, Aengus and Manannan appear in stories set centuries later, showing all the signs of immortality. _Wikipedia