Well, Morgoth was just a name given to Melkor by some elves. Melkor started out as a good guy working for Iluvatar, the Creator. He was one of the Ainur, but he went bad. Very bad. If you've ever read The Bible then Iluvatar is like God, and Melkor is like Satan. After being wounded a ton by awesome elven dudes, he was in pain all the time. I can't remember how he died though... or if he even did.
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Depends on which Dark Lord you are talking about. The first Dark Lord, of whom "Sauron of Mordor was only a servant," was Morgoth, formerly Melkor, a fallen Power/god. The second Dark Lord, was as you probably figured out, Sauron, also known as Gorthaur the Cruel. He was the "right-hand man" of Morgoth, and was a lesser spirit of power. See related links for more.
The first ever Lord of the Rings movie was The Lord of the Rings (1978), but of the trilogy starting in 2001, the first movie was called The Lord of the Rings: The Fellowship of the Ring.
Lord of the rings is not based on a true story.
The Lord of the Rings: The Return of the King.
Billy Boyd played Pippin in The Lord Of The Rings.