The Necromancer was Sauron, but was believed by the Wise of the Council of the istari to be one of the Nazgul in hiding. It was Gandalf that 'scared' the Necromancer off, and so Sauron returned to his stronghold.
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Ash nazg durbatuluk, Ash nazg gimbatul, Ash nazg thrakatuluk, Agh burzum-ishi krimpatul (One ring to rule them all, one ring to find them, one ring to bring them all and in the darkness bind them)
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