Sith genocide

"It was at this moment that the Republic made what might now be considered a mistake: the Sith no longer posed a threat to the Republic, but the Supreme Chancellor was unsatisfied. Jedi and Republic forces were sent to Korriban and other Sith planets to ensure no remnants of the Sith Empire remained."

- Jedi Master Gnost-Dural

In the immediate aftermath of the Great Hyperspace War, the Galactic Republic initiated a holocaust targeting the remnants of the shattered Sith Empire. Although the extermination nearly drove the Sith species to extinction, several members of the race were able to escape with their religious brethren aboard an exodus fleet. The fleet eventually settled on Dromund Kaas, where the Sith built a new Empire and planned for revenge against the Republic.

Appearances

 * Timeline 11: Rebirth of the Sith Empire
 * Timeline 12: The Great Hyperspace War
 * Star Wars: The Old Republic