Tuatha De Danann means tribe of goddess Danu. According to Irish mythology, the Tuatha De are a tribe of supernaturally gifted people from four cities: Falias, Gorias, Murias and Finias. They arrived in Ireland on a cloud of mist (depending on what version you read). Led by Nuada, their King, they conquered the inhabitants of Ireland, the Fir Bolg. The Tuatha De fought a second battle against the Fomorians to maintain control of Ireland. They were not successful in the third battle against the Milesians. Once defeated, the land was divided between the Milesians who ruled the surface and the Tuatha De who ruled the underground. A fictional version of the third battle is in Marked by Destiny.