After a period of peace, the Tuatha Dé Danann, the Irish race of gods, arrived. They conquered the Firbolgs, but dealt more subtly with the Fomorians, although they destroyed their hegemony over Ireland for good in the second battle of Mag Tuireadh. The Fomorians were given the province of Connacht, and were even allowed to marry some of the Tuatha Dé. The king of the Fomorians is the one-eyed Balor. Other prominent members are: Bres, Eriu, and Tethra.
The Fomorians are sometimes mythologically associated with the powers of nature which challenge man: fog, storm, winter, disease, crop-blight. The name comes from fomó, "giant", "pirate".