Korriban is well known to the Jedi and the Republic as the homeworld of the Sith.
We learn in The Old Republic (and related materials) that the Sith Lord, Vitiate took the Sith that remained after their defeat at the Great Hyperspace War and fled to Dromund Kaas, an old Sith World where they began to rebuild their empire, the one that Revan sought and the one that invades the Republic during the Great Galactic War. I'm sure this was originally a build up to a hopeful Knights of the Old Republic III but instead we have Star Wars: The Old Republic, the MMO to resolve this plot thread. In Knights of the Old Republic II: The Sith Lords, Kreia (Darth Traya) tells Meetra Surik (or the player character) that Revan had left known space to pursue the true Sith Empire. This is a question about The Old Republic and Legends.
