The Norns, the Norse goddesses of fate, were in nowise subject to the other gods, who might neither question nor influence their decrees. They were three sisters, probably descendants of the giant Norvi, from whom sprang Nott (night). According to some mythologists, their mission was to warn the gods of future evil, to bid them make good use of the present, and to teach them wholesome lessons from the past. These three sisters, whose names were Urðr, Verðandi and Skuld, were personifications of the past, present, and future. Their principal occupations were to weave the web of fate, to sprinkle daily the sacred tree with water from the Urdar fountain, and to put fresh clay around its roots, that it might remain fresh and ever green.