The Necromancer is how Sauron is referred to in "The Hobbit" - the reason that Gandalf leaves the Dwarves at the edge of Mirkwood is in order to attend the "White Council" (Galadriel and Saruman were also members surely Elrond too?). They drove Sauron from Dol Guldur but they had delayed (on the insistance of Saruman) and Sauron merely went to Mordor. All the dates are in the LOTR appendices but if you have "Unfinished Tales", you will find a narrative on the Quest of Erebor from Gandalf's perspective. In FOTR I think Galadriel talks about the council in Lorien and there may be some references in The Council of Elrond. Hope this helps.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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