The Order of the Sith Lords was a Sith order founded in the aftermath of the destruction of the Brotherhood of Darkness at the end of the New Sith Wars. The Order of the Sith Lords was founded by Darth Bane, who became its first Dark Lord of the Sith. He established the guiding principle of the Rule of Two, which said that there would only be two Sith at one time: a master who embodied power, and an apprentice who craved it. Future Dark Lords worked to fulfill the promise of Darth Bane, namely the destruction of the Jedi Order.
Circa 522 BBY, the Order of the Sith Lords was nearly destroyed by internal conflicts during the Hol Insurrection. When the conflict ended, the Sith formed an alliance with the Guardians of Lettow, making the Lettow their servants. Darth Plagueis became the master of the Sith in 241 BBY after killing Darth Erilis, and Plagueis himself was killed by his apprentice in 41 BBY. The new Dark Lord ushered in the Apocalypse and, according to prophecy, the only individual who could stop the Apocalypse and destroy the Sith forever was the Chosen One. The Dark Lord believed that Annikin Skywalker was the Chosen One. The Order of the Sith Lords was involved with the Trade Federation and its invasion of Utapau in 22 BBY, during which time they attempted to capture Skywalker to turn him to the dark side.