In the early part of the third Age Sauron dwelt in Dol Gulder in Mirkwood, None knew who he was and thus he was known as the Necromancer, one who can bring back the dead.
Sauron was not killed during the Last Alliance, but when he lost his Ring, his power was seriously weakened so he hid himself until he had enough power to reclaim Mordor which was being guarded. while he stayed in Mirkwood he kept busy by weakening the Dunedain Kingdoms and try to find his Ring.
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*~*Call me a relic, call me what you will.
Say I'm old fashioned , say I'm over the hill.
That old whine ain't got no soul.
I'll stick to Old Toby and a Hobbit hole.*~*
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