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"Your grandfather[Thrain]," said the wizard slowly and grimly, "gave the map to his son for safety before he went to the mines of Moria. Your father went away to try his luck with the map after your grandfather was killed; and lots of adventures of a most unpleasant sort he had, but he never got near the Mountain. How he got there I don't know, but I found him a prisoner in the dungeons of the Necromancer."
" -The Hobbit
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2850 Gandalf again enters Dol Guldur, and discovers that its master is indeed Sauron, who is gathering all the Rings and seeking for news of the One, and of Isildur's Heir. He finds Thrain and recieves the key of Erebor. Thrain dies in Dol Guldur. -Lord of the Rings, Appendix B
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There is nothing to interpret, the Necromancer is Sauron.