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Read about your favorite heroes, and the villains they battle.
Dol Guldur, also known as the Hill of Dark Sorcery, was Sauron's stronghold and base of operations when he worked his sorcery in the wood under the name of The Necromancer. It was located south of Mirkwood for over twelve-hundred years in the Third Age.
The White Council long feared the power in Dol Guldur might be Sauron, but Saruman opposed assaulting it. However, Gandalf later went to Dol Guldur himself and discovered that the Necromancer was indeed Sauron. He then informed the White Council, and Saruman was unable to protest. The White Council attacked Dol Guldur, and Sauron, not yet powerful enough to challenge them, fled to Mordor.
Gandalf found Glamdring in the troll's cave. He continued to use until the end of the war of the ring.
Glamdring was a sword, forged for the Elf Turgon in the First Age. For several thousand years it went missing, until Gandalf (and company) found it (along with Sting and Orcrist) in the trolls' cave in The Hobbit and claimed it for himself. He continued to use Glamdring through the events of The Lord of the Rings.