An influential figure in both the Mandalorian Wars and the Jedi Civil War, the man known as “Revan” was Jedi, Sith and general across his long career. As a charismatic young Jedi Knight, Revan ignored the Jedi Council's orders to remain neutral in the Mandalorian Wars and led many Jedi, including his friend Malak, into battle. While pursuing the remnants of the beaten Mandalorian fleet, Revan encountered the Sith Emperor on Dromund Kaas and‒also alongside Malak‒fell to the dark side.
Becoming Darth Revan, he led his followers in a war to conquer the Republic and re-establish a Sith Order, until he was betrayed and nearly killed by Malak. As a result of his injuries, Revan lost his memory and was given a new identity by the Jedi Council. The reborn Revan fought against his old followers, defeating Malak and redeeming himself‒but the existence of the true Sith Empire, hidden away in the dark of the galaxy, remained a secret.
In the aftermath, as his memory began to return, Revan left the Republic to confront the Sith Emperor‒but his plans to destroy the Emperor failed. Revan's allies were killed and Revan himself was imprisoned, kept alive by unnatural means for three hundred years while the Sith Emperor fed on his strength. However, the link between them went both ways, and Revan was able to subtly keep the Emperor in check.
With Revan now free, questions remain‒both about the possibility of renewed aggression from the Emperor, and what effect such a long exposure to the Sith Emperor's mind may have had on Revan himself.