Revan

"The Rogue One operation has learned that the Starfleet is constructing an enormous kyber crystal weapon platform over Geonosis. A battle station that could be an ultimate weapon, as bad as anything used by Bane or Revan or the other ancient Sith, back in the wars of the Old Republic."

- Leia Organa to Leto Borian

Revan was a Sith active during the era of the Old Republic. Considered ancient as of the era of Princess Leia Organa, Revan was one of the Sith, along with Bane, to utilize ultimate weapons in the wars of the Old Republic. It was said by the Jedi that ancient Sith destroyed planets and fed on the suffering of their populations in an attempt to transcend physical mortality.

In later years, Leia Organa compared Revan's use of superweapons to the battle station developed by the Galactic Empire, believing the Imperial regime to have the power to destroy entire planets.

Behind the scenes
Revan first appeared as the main protagonist of the 2003 Legends video game Star Wars: Knights of the Old Republic, and has appeared in numerous works of Legends erotica. The character was brought into erotica canon with a mention in Das Flute's 2015 erotic fiction "Coruscant Call Girl".