5,000 BBY
• The Great Hyperspace is initiated by the Sith Empire, which hopes to conquer the Republic striking at Coruscant and the Koros System.
• Sadow retreats from Republic space only to be confronted by Ludo Kressh. Kressh's forces are destroyed by Sadow before he flees to Yavin IV.
• The Sith warship Omen crash lands on Kesh, stranding what will become known as the Lost Tribe of the Sith on the planet. Its sister ship, the Harbinger, will reappear in the galaxy in 41 ABY.
• The Republic invades the Stygian Caldera under the order of Supreme Chancellor Pultimo to wipe out the Sith Empire.
• Csilla becomes locked in an ice age driving the Chiss, which were once Humans, underground.
4,999 BBY
• Vitiate executes the Sith Council and performs a dark ritual on the planet Nathema which kills all 8,000 Sith on the planet, rendering it lifeless. He proceeds to declare himself the Sith Emperor and leads the exodus of the surviving Sith.
4,985 BBY
• The Sith on Kesh poison the water supply of Keshiri villages, killing 10,000 of the natives.
4,980 BBY
• The remnants of the Sith Empire arrive on Dromund Kaas where they found a new Sith Empire.
4,800 BBY
• The spice ryll is discovered on Ryloth.
• The Gank Massacres begin when the Porporites are exposed to ryll. The Ganks, hired by the Neimoidians to protest them, wipe out the Porporites and go on to wage war against the Republic. Supreme Chancellor Vocatara commissions the Juggernaut War Droids to end the fighting, and the Jedi begin using the modern lightsaber during the fighting.
4,775 BBY
• The Gank Massacres are ended.
4,500 BBY
• The Barabel War begins.
• The Galactic Republic first explores the cloning capabilities of the Kaminoans.
4,400 BBY
• The Jedi Padawan Freedon Nadd is denied Knighthood. In response, he flees and ends up exploring the Yavin system where he encounters Naga Sadow's spirit, which brings him to the Dark Side. Nadd kills Sadow's spirit and takes over the planet of Onderon, establishing a dark side aligned Force sensitive hereditary monarchy.
4,250 BBY
• The Third Great Schism occurs in which Dark Jedi fight the Jedi Order on Coruscant. They flee to the Vultar system and end up causing the Vultar Cataclysm, in which the Cosmic Turbine destroys the entire Vultar system, the Dark Jedi, and itself.
4,225 BBY
• The Republic initiates the Kaikieli Reconquista, which retakes the world of Kaikielius from criminal elements.
4,200 BBY
• The Mecrosa Order, a group of assassins that serve and protect the Tapani Sector's House Mecetti, is founded by Viscountess Mireya, becoming slowly corrupted by Sith teachins over the following two centuries.
• Tatooine is first settled.
• The Hapes Cluster becomes the home to the Lorell Raiders.
4,166 BBY
• The Republic makes contact with the Mon Calamari, who had independently developed their own interstellar government and hyperdrive. Mon Calamari Space becomes an Allied Region.
4,100 BBY
• The healing agent bacta is introduced.
4,056 BBY
• The Tarisian Civil War occurs between the humanocentric nobility and the alien lower class.
4,050 BBY
• The Battle of Lorell occurs in which the Jedi defeat the Lorell Raiders, causing their retreat into the Hapes Cluster which leads to their development as the Hapan species.
4,030 BBY
• The Lorell Raiders are attacked again by the Jedi, leading to the hatred of the Jedi by the Hapans.
4,020 BBY
• Czerka Corporation claims Kashyyk, renaming it Edean.
4,017 BBY
• The Mandalorians continue their Crusades against their neighbors and former territory by waging war against Basilisk.
4,015 BBY
• The Great Droid Revolution occurs on Coruscant.
4,002 BBY
• Kuat is conquered by the Mandalorians.
• Onderon makes contact with the Republic.
4,000 BBY
• The Tallaani Shipyards are established.
• A mining colony is established on Peragus II. Initially mining efforts crack the planet, and mining efforts move to the resulting asteroid field.
• Swoop racing becomes popular.
• The Exchange is established on Taris.
• The Krath are founded by Aleen and Satal Keto in the Empress Teta System.
• The Jedi Teple is constructed on Coruscant.
• Nal Hutta and Nar Shaddaa descend into crime havens along with most of Hutt Space, giving rise to the Hutt Cartel.
