The Sith were originally a species from Korriban, and the first Dark Lords of the Sith were a group of exiled Jedi who colonized Korriban and enslaved its population before forming their own ...

The One Sith was founded on the planet Korriban, which was the original homeworld of the Sith species. In other words, just as Yoda was able to hide himself on Dagobah, the overwhelming dark side ...