Korriban

The earliest Sith lived on the red, dusty planet of Korriban, determined to grow strong despite the inhospitable climate. Their success culminated in a bold civilization, made stronger when dark Force-users arrived and interbred after being driven out of the early Jedi Order. This ancient Sith civilization eventually became a superpower and challenged the Republic during the Great Hyperspace War. Their defeat drove a handful of survivors into deep space where they regrouped and rebuilt, determined to return.

Over time, the new Sith Empire lost its way back to Korriban, until a visit a few centuries ago by two Jedi returning from the Mandalorian Wars. Turned to the dark side, the two Jedi, Revan and Malak, attempted to reclaim the Sith's legacy in the known galaxy, but turned on each other and self-destructed.

The true Sith Empire, governed by a thousand-year-old Dark Emperor, wisely waited, and returned to the known galaxy only when completely prepared to defeat the Jedi and the Republic.

Retaking the holy planet of Korriban as a top priority, the Sith re-established the glorious Sith Academy and began training a new generation of Sith to inherit their dark legacy and seize their birthright as the true rulers of the galaxy.
 * See also: Codex/Korriban

Codex entries

 * Main article: Korriban/Codex entries

Korriban has 29 codex entries: 4 bestiary, 3 datacrons (see below), 7 locations, 6 lore, 2 organizations, 3 persons of note, 2 species, and 2 titles.

Sith Academy
The Sith Academy, located between Dreshdae and the Valley of the Dark Lords, is one of the prime points of the planet. It has been there that, during centuries, many Force Sensitives aspired to be worthy of the Sith title. It is a place of great dark energy which makes it ideal for meditation for the Sith. The source of that dark energy comes from the planet itself, the proximity from the Valley of the Dark Lords and is fueled again by the history behind it.

After the death of the Sith Lords Sion, Traya and Nihilus by the exiled Jedi, 5 years after the Mandalorian Wars, the Academy fell into decay. For nearly 300 hundred years it was left abandoned till the Sith returned and began training new additions. It was then rebuilt with a different layout than the one it had.