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Sauron: Silvan Elves
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After the war was over, and Sauron had been defeated, there apparently was no talk of marching into Mordor and taking Sauron down a peg. Many Elves fled Middle-earth and Gil-galad elected to establish a new outpost at Imladris, which was farther north (and distant from Mordor) and more defensible than Eregion had been. The army or armies which had pursued Sauron back to Mordor must not have had sufficient resources to force their way into the land. So the implication of their withrdawal is that the Eldar and Numenoreans ran into something they were not ready to deal with.
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Sauron eventually initiated a scheme that he hoped would make him able to subjugate the Elves as well. After assuming a beautiful appearance and calling himself Annatar, "Lord of Gifts,"[27] Sauron befriended the Elven-smiths of Eregion, and counselled them in arts and magic. To the Elves, Sauron hinted that he was an emissary of the Valar, specifically of the Vala Aulë whom the Ñoldorin Exiles held in high regard. (Another assumed name of Sauron's was therefore Aulendil, Friend of Aulë.) This was actually a half-truth, since Sauron had indeed been attached to Aulë in the remote past, before he joined Melkor. Some of the Elves distrusted this "Annatar" or "Aulendil", especially the Lady Galadriel in Lórien and Gil-galad, the High King of the Ñoldor. However, the Elves in Eregion did not heed their warnings.
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With Numenor out of the way Sauron returned to Middle-earth, wounded but not greatly weakened. He may have contemplated turning his full attention upon Gil-galad, but he would have quikly learned that Numenorean survivors led by Elendil were establishing two new kingdoms in the north. Although many of the Numenorean colonies would now support Sauron, the Faithful Dunedain were helping Gil-galad to consolidate his power in the north. In effect, Sauron had replaced an immensely powerful Numenor, which he could not overcome militarily, with an immensely powerful alliance of Elves and Men.
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At the behest of Gandalf, and unknown to Sauron, Frodo and his friends set out to take the Ring to the Elven stronghold at Rivendell. There Elrond convened a high council of the peoples of Middle-earth to decide how to handle the crisis. The council determined that the Ring must be destroyed, and Frodo and his friend Samwise Gamgee joined the Fellowship of the Ring, accepting the council's mission to destroy the Ring forever by casting it into Mount Doom.
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Prior to the publication of The Silmarillion Sauron's origins and true identity were unclear to those without full access to Tolkien's notes. In early editions of Robert Foster's The Complete Guide to Middle-earth, Sauron is described as "probably of the Eldar elves."
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Sauron was still a master of shapes and forms, and he took a fair shape and whispered poison into the ear of the King, seeding the Númenóreans distrust of the Elves and the Valar. He persuaded them to tear down their temple to Eru, the One, and to worship Morgoth instead. A massive temple was built, where human sacrifice was carried out.
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