Darth Tuulin

"Darth Tuulin was a Sith Lord who was believed long dead by the Jedi Order."

- Darth Plagueis talks about his deceased Master

Darth Tuulin born Vuusha-Qay-Rama, was a Nikto Jedi Master who fell to the Dark Side and was presumed dead by the Jedi Order Tuulin however drained the life out of Jedi he found and used their lives to empower his life, the Sith Lord lived over 500 years.