Centuries before the reign of the Galactic Empire, a battle took place on the planet Gap Nine. The battle was fought between the Jedi Order and an unidentified group who had been using several temples on the planet as a site of malevolent worship. The group were defeated by a force of Jedi Knights, who eventually converted the temples into storehouses of knowledge.
- The Complete Star Wars Encyclopedia, Vol. I, p. 321 ("Gap Nine")