Old Sith Dynasty

The Old Sith Dynasty, sometimes known as the First Sith Empire was an ancient government that existed during the Post-Boshru Era. It was the oldest and longest lasting known government in the history of the galaxy, existing for a total of 83,475 years and spanning two Eras. It was formed by Evvret Darth, a rogue Jedi who was barred from the Order after questioning the Prime Jedi. He and his followers were exiled to the planet Korriban and enslaved the native Sith population, desiring to build a new Empire to challenge the Jedi Empire and get revenge against their former brothers.

The Sith revealed themselves to the Jedi for the first time ever in the War of Revelations in 81,640 BBY, sparking the very first conflict between the two factions that would last for tens of thousands of years. However, despite being able to destroy the Jedi temple on Tython and kill many Jedi, the Sith are pushed back and suffer heavy casualties.

Due to both factions suffering large casualties, they both spent over 70 thousand years in seclusion as the rest of the galaxy expanded and evolved around them, including the invention of the hyperdrive.

After the Jedi Empire reformed into the more peaceful Jedi Order, a Sith Infiltrator stole the Blade of Darkness from the Jedi Temple on Ahch-To. This began the Force Wars, which lasted for over 4000 years, decimating Korriban and many other parts of the galaxy in the process. The war ended in 6500 BBY with the death of the leaders of the Dynasty, effectively ending Evvret Darth's lineage and causing the collapse of the Dynasty.

Although the Empire was lost, it built the foundations for all future incarnations of the Sith, including the Archiac Sith Empire, The New Sith Order and the Galactic Empire.