Naga Sadow

Naga Sadow was a Sith Lord who lived around the time of the Galactic Republic. He was really powerful, but was defeated by various Jedi, though they weren't able to kill him. They turned him into a spirit who haunted the Sith Tomb on Korriban, and he waited for someone in his blood line that was Force sensitive to rescue him and turn him into a person for centuries, until in 44 ABY, when someone in his blood line named Ty Sadow was born, and was Force-sensitive. He was rescued by her from his tomb sixteen years later, and took command of the Sith Empire Reborn, warring with the current New Galactic Empire.