Perhaps one of the largest threats to the Galaxy since Lord Malak ravaged the Republic. Sheev Palpatine was born on Naboo, 84 Years before the Battle of Yavin. At one point Sheev became well versed in the Force, and eventually succumbed to the Dark Side under the ever watchful gaze of the Sith Lord, Darth Plagueis.
At one point, as per the rule of two Palpatine was able to kill Plagueis to earn the role of Darth for himself, by murdering him in his sleep. With the assassination successful, there was no one left to challenge his claim to power- and thus his rule began.
Though simply living in the shadows was not enough for this young Dark Lord. He climbed his way through politics, eventually earning himself in a seat in the Galactic Senate. It was here that his grand plan would begin. By manipulating the scenes ever so slightly, hints of a massive shift in the galactic powers would come. That a brutal and long war was about to ravage an unsuspecting Galaxy. At one point, a Jedi sensed this catastrophic danger the orderr would face and begin to create an Army of Clones to counter act, though he was soon killed and the project was handed over to the Sith.
Each day a new piece of Palpatine's plan was enacted. From the blockade of Naboo, to the discovery of the Chosen One, Anakan Skywalker, Palpatine plotted and adapted his strategies to enact the perfect coup.
The Blockade Of Naboo was his initial rise to power. Using the Trade Federation, Palpatine was able to put political pressure on his Rival, Supreme Chancellor Valorum , which lead to the senate's distrust in his more peaceful actions. With a landslide vote, Valorum resigned, and Palpatine was elected into Office.
Though Sheeve had the most powerful seat in the Galaxy, his greed was far worse. Phase II of his plan began. With the deliberate succession of several Star Systems, a war was coming. One that Palpatine planned for and controlled all the strings. The Aforementioned Clone Army was officially sanctioned, and the War broke out on Geonosis. A war designed to further destabilize the Jedi Order, to a point where it could be obliterated in one swift strike. And in the following years, his plan worked flawlessly. The Jedi Order was spread out fighting alongside this Clone Army, which turned on their Jedi partners with a single order from Palpatine. Almost over night the Entire Jedi Order, the once more heated rival of the Sith was snuffed out, with only a few survivors.
With the Jedi Order in ruin, Palpatine was now fully able to control the Republic, stop this pseudo war, and reform the Republic into a totalitarian dictatorship, known as the First Galactic Empire, where it would continue to reign for nearly twenty years.