Darth Vulkan

Darth Vulkan, born as Ignan Volcovo, was a Sith Lord during the Age of the Empire, and apprentice to Darth Sidious. After the Battle of Endor, then he killed the emperor due to his inability to predict the Rebel Alliance's victory in such a risky tactic as he did, becoming the master. And before taking up an apprentice, he took the remainders of The Empire away to lick their wounds, and rediscovered Korriban.