First Great Schism

The First Great Schism was the origin of the first split between the Light and Dark Jedi. It occurred around 24,500 BBY.

History
The Legions of Lettow was first established by dissident Jedi who believed that true power was achieved not through pensive meditation, as taught by their Jedi Masters, but through emotion. The tension between the Jedi and these dissident fallen Jedi, led by General Xendor and his lover Arden Lyn, grew until conflict erupted. They ended when Xendor was slain and Awdrysta Pina stopped Arden Lyn's heart.

Dark Jedi

 * Arden Lyn
 * Xendor

Jedi

 * Awdrysta Pina

Behind the scenes

 * For many years, it was believed that the First Great Schism was the event that resulted in the formation of the Sith Order, with Naga Sadow's entry in The New Essential Guide to Characters somewhat confirming that, saying that Sadow was the first Sith Lord in 20,000 years to reestablish contact with the Republic. However, Lucasfilm had intended the Hundred-Year Darkness as the event which lead to the establishment of the Sith Order, and was retconned as such in The New Essential Chronology. Dan Wallace, who worked on both projects, has since stated that the Naga Sadow entry was in error.