Karness Muur seems to be an OG Sith Lord who predates even Marka Ragnos. Murr was among the Dark Jedi who participated in the Battle of Corbos, and exiled to Korriban after they lost the battle. Along with Ajunta Pall and Xoxaan, he subjugated the Sith species and established the Sith Empire.
From – Star Wars: Legacy #30
