Dooku

Dooku, also known as Count Dooku after his separation from the Jedi Order later on in his life, or by the Sith title of Darth Tyranus, was a Jedi Master turned Sith Lord who most notably served as the public leader of the Confederacy of Independent Systems during the Clone Wars. One of the Lost Twenty, Dooku became disenfranchised with the Jedi Order thanks to the manipulations of Darth Sidious, ultimately allowing him to take up the role of Sidious' Sith apprentice after the apparent death of Darth Maul during the Battle of Naboo. As Darth Tyranus, Dooku would help to orchestrate the final stages of the grand plan constructed by Sidious and his late master Darth Plagueis to destroy the Jedi Order and overthrow the Republic, serving as the public figurehead of the Separatist movement while his master pulled the galaxy's strings from the shadows.