Going back to the original civil war h That split the Jedi and sith. When and how did the Sith rule before, and did it always have two Sith lords even when it was in power previously, or was there an … Both cannon and otherwise. Both Clones Wars and Rebels have a few hints here or there, indicating the Sith have seemingly had control of … In the movie Revenge of the Sith, Palpatine tells Anakin: "Once more the Sith will rule the galaxy" right after Anakin turns to the dark side and becomes Vader.. As others stated there really was only one time the sith had control over most of the the known galaxy. There were several times through history when the Sith essentially controlled, if not the entire galaxy, then at least part of the galaxy. There were numerous attempts. In episode 3 Palpatine states, "Once more the Sith will rule the galaxy, and we shall have peace"Mace says, "The oppresion of the Sith will never return," after overpowering Palpy..