Before he was known as Morgoth, he was Melkor, the most powerful of the angelic Ainur.

Melkor was rebellious,While his fellow Ainur went on to become Valar

He created orcs and dragons and, with the help of the evil spider Ungoliant, killed the Elven king Finwë

It was then that Fëanor, Finwë's son and maker of the Silmarils, dubbed him 'Morgoth

Given the fact that Morgoth isn't technically dead, it's often been wondered by Lord of the Rings fans whether the Dark Lord would ever return.