Darth Sidious, born Sheev Palpatine, is a deceased character in Star Wars: Legacies of the Galaxy. A Dark Lord of the Sith from the planet Naboo, Palpatine was a polititian who infiltrated the Galactic Republic as a senator before becoming Supreme Chancellor. During his tenture as the last leader of the Republic, Palpatine manipulated the events of the Clone Wars by leading the enemy Confederacy of Independant Systems/Separatist Alliance as Sidious. At the end of the war during the year 19 BBY, Palpatine issued Order 66 to the Clone Troopers of the Republic to murder their Jedi commanders in cold blood; claiming they are enemies of the state. While his Sith apprentice, Darth Vader, wiped out the Separatist due to no longer requiring them, Palpatine declared himself Emperor to the Galactic Senate; much to the applause of most senators. Having transformed the Republic into the Galactic Empire, Darth Sidious had complete control over the primary galactic government.
For the next couple decades, Palpatine ruled the Empire with an iron fist, punishing and murdering those who stood in his way with a sadistic laugh. During the Battle of Endor in 4 ABY, he was betrayed by his apprentice, Vader, due to threatening his son, Luke Skywalker. While the Emperor's body was destroyed, Palpatine returned by possessing cloned duplicates of himself in his ultimate bid; to rule the universe forever. Regrouping a large amount of the Empire and forming the Dark Empire, Sidious waged war against the New Republic in an attempt to claim Vader's descendants as his own to possess. However, Sidious fell once and for all in 11 ABY.