Yavin 4 is one of the 26 moons orbiting the gas giant Yavin. In ancient times, the Massassi race lived on Yavin 4. The Sith lords Naga Sadow and Exar Kun, respectively, came to Yavin 4 and enslaved the Massassi, having them build huge temples that were focal points of power. Exar Kun later imprisoned his spirit inside one of the temples.
During the Rebellion against the Empire, the Rebel Alliance used Yavin 4 as a base. After the rise of the New Republic, Luke Skywalker chose the moon as the location for his new Jedi Praxeum. However, he and his students had to defeat the revived spirit of Exar Kun, which they successfully did.
It is featured in the game Star Wars Galaxies
Read more about this topic: List Of Star Wars Moons