Fall of the Old Republic

The Fall of the Old Republic described a long period of time in which the Old Republic, the reigning galactic government during its time, slowly declined in its power.

History
At some point following the ignition of the ancient conflict between the Jedi Order and Mandalorians, the long period of constant warfare between both the warrior civilization and the Sith Empire left the resources of the Old Republic strained. At that time, the Old Republic continued to fend off the onslaught of the Sith, who slowly began gaining the upper hand.

During one of the wars that the Old Republic faced in the period of its fall, a Mandalorian of House Vizsla stole the Darksaber from the Jedi Temple on Coruscant. As the Old Republic began to implode upon itself, the galaxy entered an age of Sith dominance, where the dark lords ruled over much of the galaxy. .

Eventually, both the Jedi and the Old Republic managed to reorganize their forces and fight back against the Sith during a period known as the "Dark age", ultimately resulting in the order's defeat, save for one lone dark lord. The crumbled Old Republic then reorganized itself in 1032 BBY, becoming the Galactic Republic.