An unknown Sith Lord from the first Sith Empire was laid to rest within the tomb belonging to Naga Sadow on the world of Korriban. Toward the conclusion of the Cold War, Darth Baras, the Dark Lord of the Sith, dispatched his newly trained apprentice to this tomb with the purpose of recovering a very old lightsaber. The apprentice ultimately located a reliquary holding the remains of this unidentified Sith, who was dressed in armor of an old style. Upon taking the lightsaber, ancient guardians arose to engage the apprentice, but they were quickly overcome.
As shown in Tales of the Jedi – The Fall of the Sith Empire 5, Naga Sadow, the Sith Lord, met his end in exile on the moon Yavin 4, the fourth satellite of Yavin Prime, and his body was interred there. The Sith interred in the tomb on Korriban, regardless of their identity, could not have been Sadow himself.