Codex/Galactic History 75: The Jedi Civil War

The Galactic History 75: The Jedi Civil War codex entry is located within the Achievements:Datacrons section of a player's codex once it has been unlocked.

Codex entry
"This datacron holds unheard of power and knowledge collected by an ancient race. You access its power and discover writings which are clearly only one small piece of a massive galactic history:

Revan and Malak, once great Jedi, had turned to the dark side and sought to conquer the Republic. With an infinite fleet produced by the Star Forge space station, they seemed as unstoppable as the Mandalorians. They took control of entire systems and established a new Sith academy on Korriban.

This time, the Jedi Council did not hesitate to act. The Republic lured the Sith Lords into battle against a small fleet. This allowed a Jedi strike team led by Bastila Shan to board Darth Revan’s flagship.

Darth Malak had plans of his own. Having grudgingly taken his role as Revan’s apprentice, he decided to usurp his master. With the Jedi providing a perfect distraction, Malak fired on Revan’s flagship, destroying the bridge. Malak claimed the title of Dark Lord, not realizing the Jedi strike team had survived and taken Revan–injured, but alive–as their prisoner."