Darth

"Henceforth, you shall be known as Darth&hellip; Vader."

- Darth Sidious, upon making Anakin Skywalker his new apprentice

Darth was a title given to the Dark Lords of the Sith Order, which preceded a moniker different from the birth name. It roughly translated to "Dark Lord." The Sith names of Sheev Palpatine, Count Dooku, and Anakin Skywalker were Darth Sidious, Darth Tyranus, and Darth Vader, respectively.

Era of the Sith
During a time when the Sith were plentiful and powerful, a male Sith, Darth Atrius, was the bearer of the Darth title.

The Phantom Menace
Years after the full-scale Jedi–Sith war, when Sith Lords were destroyed by the Jedi, Darth Bane&mdash;the sole Sith Lord survivor&mdash;established the Rule of Two and restored the title. In at least two known cases (that of Count Dooku and Anakin Skywalker), the Darth title and the accompanying moniker were bestowed onto the Sith apprentice by the Master.

Imperial Era
The Jedi Master Obi-Wan Kenobi used "Darth" as a form of address when talking to Darth Vader in 0 BBY during the Rescue of Princess Leia.

Non-Canon Appearances

 * Star Wars Epic Yarns: A New Hope
 * Star Wars Epic Yarns: The Empire Strikes Back
 * Star Wars Epic Yarns: Return of the Jedi
 * LEGO Star Wars: Droid Tales Episodes I-III