Vij Markos was a Jedi Master of the Gran male variety. He was a member of the Jedi Order throughout the Galactic War, a conflict that pitted the Galactic Republic against the newly reformed Sith Empire.
Approximately in the year 3641 BBY, Markos, a Jedi Master, found himself stationed on Belsavis. While there, he came across Elshuu, an ancient entity of immense power, who had been imprisoned on Belsavis for millennia. Markos formed the opinion that Elshuu's devoted followers had become active again, endeavoring to release their master. Subsequently, he assigned a Republic space traveler with the mission of confronting Elshuu and guaranteeing that he would remain confined to Belsavis indefinitely.