- The First Great Schism erupts in the Core Worlds between the Jedi Order and the Legions of Lettow, members of the Jedi Order who seek to use the dark side against the Order's wishes. The Legions' leader Xendor originally asked for permission to create an academy for the study of Force techniques outlawed by the Jedi, and after their refusal he founded the Legions on Lettow—prompting the Order to declare war on them.
- "Heritage of the Sith" — Star Wars Insider 88
- Jedi vs. Sith: The Essential Guide to the Force
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- The Essential Guide to Warfare