Republic Dark Age

The Republic Dark Age was the term given to the last century of the Draggulch Period, from around 1100 BBY to the Ruusan Reformation of 1000 BBY. During the Dark Age, the Republic essentially ceased to exist.

Since the start of the Draggulch Period in 2000 BBY, the Republic had been in decline. Thousands of worlds were abandoned to the New Sith Empire, while more were abandoned during the Republic's retreat. Thousands of longstanding corporations went bankrupt, lawlessness spread as the Republic government became increasingly overburdened and ineffectual, and numerous mines of valuable minerals dried up. The collapse escalated following the Sith victory at the Battle of Mizra in 1,466 BBY.

However, all these events were merely a prelude to the Dark Age. The Senate granted almost all of its authority to the Supreme Chancellor, many of whom were Jedi at that point. The Jedi themselves wielded near-unlimited power. What little remained of the Republic Navy and Army were disbanded and absorbed into the Jedi Order's Army of Light.

The Republic could no longer afford to maintain the HoloNet beyond the Core Worlds, so communications between worlds outside the Core had to be maintained through couriers. Even worse, a Galaxy-wide epidemic of Candorian plague killed off as much as 2/3 of the population of some worlds.

Presumably, the Dark Age was considered over by either the Sith defeat at the Seventh Battle of Ruusan or the following Ruusan Reformation.