UPDATE - 11th. June 2010 (Timeline 8 - The Jedi Civil War)

Taken from swtor.com:

Quote :: One of the greatest threats to the Republic preceding the Great War arose approximately three hundred years before when the Sith Lords Darth Revan and Darth Malak began the Jedi Civil War. Jedi Master Gnost-Dural’s historical investigation steps back to this era, and he examines new evidence which reshapes the Order’s understanding of the events surrounding Revan’s fall and his ultimate fate.

BTC 303 – Three hundred years before the Sacking of Coruscant, two prominent Jedi Knights pursued enemy forces into Deep Space at the conclusion of the Mandalorian Wars. When the two Jedi, Revan and Malak, returned to Republic space, they had fallen to the dark side. As Sith Lords, Revan and Malak began searching the galaxy for a powerful ancient artifact known as the Star Forge. During their dark campaign, however, Malak’s ambitions grew and eventually drove him to betray Revan, sparking the bloody Jedi Civil War. Though Revan was ultimately redeemed and restored peace to the galaxy, he disappeared afterward in search of a great darkness in Deep Space. Through his investigation, Master Gnost-Dural now confirms that this great darkness is the Sith Empire the Jedi Order battles today….

Watch the latest Timeline holorecord, The Jedi Civil War, narrated by actor Lance Henriksen.

You can also download a high resolution version of this video.