The Witch King sounds like a likely candidate.
Morgoth falls, his greatest servant rises--->Sauron falls, his greatest servant rises?
Quote:
The crown rolled away with a clang. Éowyn fell forward upon her fallen foe. But lo! the mantle and hauberk were empty. Shapeless they lay now on the ground, torn and tumbled; and a cry went up into the shuddering air, and faded to a shrill wailing, passing with the wind, a voice bodiless and thin that died, and was swallowed up, and was never heard again in that age of this world.
From The Battle of the Pelennor Fields
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How about the next age?
And while we're on the subject, wasn't this the basic premise of the MERP pen-and-paper RPG? Fighting new evils in the Fourth Age? I believe they had some really far-out ideas, including Sauron's half-elf daughter(born from some Elf maiden he seduced in Eregion), Dark Elves of the East etc.