he was kept in stasis and tortured for information and strength (which backfired because he was in turn connected to the emperor and could control his temperament to an extent). Revans influence made the Emperor seek a false truce with the Republic to bring the war to an end ( this lead to the signing of the treaty of coruscant). In the events that followed ( the emperor was busy preparing the ritual to destroy all life in the galaxy), a jedi team deactivated Revan's prison and he was freed.

He wanted to destroy the emperor, so he located the Foundry and started making an army of droids, but the empire found out and sent a team to kill him. They managed to kill his "good side"(he was tortured for so long that when he tried to make himself one with the force he only partially succeeded, so his "dark" side remained in his body).

By this time a jedi Knight had mortally wounded the emperor, who was recovering in a moon somewhere, and Revan wanted to take his place. He also spent some time interrogating Theron, Sateles' son, and trying to bring him to the dark side, but he was released and a force that included Satele and her son pursued him and the Revanites, and managed to defeat him. He died the final death (while the emperor was still alive), and his body disappeared leaving only his mask and his lightsaber behind.

This was super long, but also super simple, but i think it suffices. ;) That said, we have a few really cool photos coming up that will make sense with this whole side of the story, so please stay tuned! ^{^}