The organization was created roughly 250 years after the death of Darth Ruin, and suffered the defeat of their leader at the hands of Jedi Master Murrtaggh. The Underlord's Zeltron general led the defense against a simultaneous assault on the Black Knights Malrev IV fortress, a diversion staged by Mandalorian mercenaries to distract from the Jedi assassination attempt on their leader. The diversion was a success and the Black Knights' leader fell.
The group's fate in the aftermath of the battle is unknown, although the Black Knights later reformed and rose up again a number of times over the following centuries, and were combated by the newly promoted Padawan Yoda during the Fluwhaka revolt.
In the second draft of A New Hope, the "Black Knights of the Sith" (earlier the "Knights of the Sith" in the rough draft) are named as the destroyers of the Jedi Bendu of Ashla. They were a group of pirates taught the ways of the Bogan by a fallen Padawan named Darklighter. In time, the Black Knights became the Galactic Emperor's personal guard. They were renamed the Dark Lords of the Sith in the third draft.
In the book preface for Star Wars: Darth Vader: A 3-D Reconstruction Log, Darth Vader was referred to as the "Empire's black knight." However, he has no affiliation to the specific group beyond common Sith affiliation, having come into existence a little more than a thousand years after them.
- Evil Never Dies: The Sith Dynasties on Hyperspace
- The Complete Star Wars Encyclopedia, Vol. I
- The Essential Atlas
- The Jedi Path: A Manual for Students of the Force