Korriban

Korriban, known as Pesegam during the reign of Xim, and also known as Moraband during the Clone Wars, was the sole planet in the Horuset system, located across the galaxy from Koros Major. It was the original homeworld of the Sith species and a sacred planet for the Sith Order, housing the tombs for many ancient and powerful Dark Lords of the Sith, and containing immense dark side power.
After the Hundred-Year Darkness, the remaining Dark Jedi interbred with the Sith species and ruled the Sith using their Force powers. After the Great Hyperspace War, Korriban was abandoned and became a barren world. It was the site of a Sith Academy during the Great Sith War, Jedi Civil War, Great Galactic War, Cold War, Galactic War, and New Sith Wars and was the headquarters of the Brotherhood of Darkness and One Sith.
This remote, foreboding planet was the original homeworld of the Sith species. Some time prior to 200,000 BBY, the Sith began to build monuments in the Valley of Golg. Circa 100,000 BBY, the Sith began to develop a civilization. Circa 30,000 BBY, there was a Killik incursion of Korriban. The insectoid attackers were swiftly driven off by the Sith.