Sorry DuracellEnergizer, my misunderstanding, I never read any of the EU books

Owyn_Merrilin said:

Edit: Also with the whole Sith thing, Timothy Zahn mentions something kind of cool in the annotated version of Heir to the Empire, which is that when he was writing the book, nobody aside from Lucas himself actually knew what a Sith was -- for all anyone knew, it could be a species or a group that Vader ruled over in his spare time. He actually wanted the Noghri to be called the Sith, and he described them to look kind of like Vader's armor, and imply that it was based on them, but Lucas nixed the name. It's also why older EU novels were so big on the phrase "dark Jedi." The writers weren't entirely sure what a Sith was, so they went with something a bit more simple and descriptive, starting with Zahn.

I remember thinking when I was a kid that perhaps Vader was an alien or a person from a planet called Sith, but when the back-story of Vader being badly burned by lava whilst battling with Obi-Wan at a volcano, I do remember deciding that Sith must be a Jedi who uses the dark side, I've never read any Timothy Zahn books