Dessel (Earth-2042)

"The Sith killed each other. Victims of their own greed. But from the ashes of destruction, I was the last survivor."

- Darth Bane's specter

Darth Bane, born Dessel, was a legendary male Force-sensitive Human Dark Lord of the Sith and the sole survivor of the destruction of the Sith at the hands of the Jedi Order during the Old Sith Wars thousands of years before the Clone Wars. As the only surviving Sith, Bane recognized that Sith infighting had weakened them to the point that the Jedi could destroy them. To rectify this, Bane reformed the Sith and created the Rule of Two, mandating that there could be only two Sith—a Master and an apprentice—at any given time. These new Sith would begin a plot to destroy the Jedi in secret. With Bane's defeat, the Jedi wrongly believed that the Sith were defeated with him.

Source

 * https://starwars.fandom.com/wiki/Darth_Bane