After being denied Knighthood, a Padawan named Freedon Nadd explores the Yavin system and encounters Naga Sadow's spirit, who sways Nadd to the dark side of the Force. Nadd kills Sadow's spirit and establishes himself as a king on the planet Onderon, where he institutes a policy to banish criminals into the wilds beyond the walls of the city of Iziz. Nadd establishes a dynasty of dark side-wielding monarchs.
The exiled criminals manage to tame Onderon's wild beasts to become the Beast Riders, and the Beast Riders wage war on Iziz, sparking the Beast Wars.
The Mon Calamari of Dac begin to launch starliners to colonize planets around their homeworld over the next two centuries. (Approximate date)
↑The New Essential Chronology states that the Ruusan Reformation occurred in 1000 BBY, which is the zero point of the calendar based on the Ruusan Reformation, so the difference between the calendar based on the Battle of Yavin and the Ruusan Reformation's year-notation system is 1,000 years. This date is derived using simple math based upon other confirmed dates.