Treaty of Coruscant is the first entry into the Galactic Timeline.
Star Wars: The Old Republic is set during a unique time period in the galaxy’s history. Decades of war concluded with the Sith Empire sacking the Republic’s capital planet, Coruscant, and forcing Republic Senators and the Jedi Council to agree to a painful peace treaty.
ATC 0 – In the years following the treaty, the Jedi Council tasked Master Gnost-Dural, Keeper of the Jedi Archives, with re-examining the galaxy’s history in light of recent events. In his insightful reports, Master Gnost-Dural established a new galactic timeline that became an educational reference for years to come… the very same years in which Star Wars: The Old Republic takes place.
The first entry of this holorecord discusses the events just before the pivotal signing of the Treaty of Coruscant.