Consistent accounts of Saruman's earlier history appear in Appendix B to The Lord of the Rings, first published in The Return of the King, and in the posthumously published The Silmarillion (1977) and Unfinished Tales (1980). All were written in the mid-1950s. Saruman, like Gandalf and Radagast the Brown, is one of five 'wizards', known as the Istari, who begin to arrive in Middle-earth some two thousand years before the beginning of The Lord of the Rings. They are Maiar, envoys of the godlike Valar sent to challenge Sauron by inspiring the people of Middle-earth rather than by direct conflict. Tolkien regarded them as being somewhat like incarnate angels. Saruman initially travels in the east; he is later appointed head of the White Council and eventually settles at Gondor's outpost of Isengard. Fifty years before The Lord of the Rings, after his studies reveal that the One Ring might be found in the river Anduin near Sauron's stronghold at Dol Guldur, he helps the White Council drive out Sauron in order to facilitate his search.