Galactic Republic
In the EU, the Sith trace their origins to the followers of a dissident Jedi named Ajunta Pall, who endorsed the use of the Dark Side of the Force, contrary to Jedi orthodoxy. After Pall and his “Dark Jedi” followers were exiled for their practices, they eventually settled on a planet named Korriban, which was occupied by the "Sith," a red-skinned humanoid race with a high prevalence of Force-sensitives. Over the course of centuries of intermingling between the ethnic Sith and Dark Jedi, the name "Sith" would come to apply to the martial philosophy and political affiliation created by the former Jedi exiles on Korriban, rather than a specific race. This Sith regime would strike out at the Galactic Republic and Jedi on numerous occasions. Notable conflicts between the Sith and the Galactic Republic include the "Great Hyperspace War," in which the Sith would launch a massive invasion of the Republic but succumb to infighting, and the “Sith Holocaust,” in which the Galactic Republic failed in its attempt to exterminate the Sith from known space, leading the Sith survivors to take a vow of eternal vengeance on the Galactic Republic. The EU also describes the exploits of Sith characters following the collapse of Emperor Palpatine's Galactic Empire and the restoration of the Republic, such as the attempt by “Darth Krayt” to establish a New Sith Order on Korriban.