Sheev Palpatine is a fictional character in the Star Wars franchise created by George Lucas. He first appears on screen in The Empire Strikes Back (1980), in which he is credited as The Emperor, and is the overarching antagonist of the three film trilogies in the Skywalker Saga, in which he is portrayed by Ian McDiarmid. The character is also known by his Sith name, Darth Sidious, which was first used in the novelization of The Phantom Menace (1999). In creating Palpatine, Lucas was inspired by real-world examples of democratic backsliding during the rise and rule of dictators such as Julius Caesar, Napoleon Bonaparte, and Adolf Hitler.

The Galactic Republic, commonly known as The Republic, is a fictional political entity in the Star Wars universe that predates the formation of the Galactic Empire. It is prominently featured in the prequel trilogy of Star Wars films, offering a glimpse into its history and functioning. In the original trilogy, which takes place after the events of the prequels, the Republic is referred to as the Old Republic, suggesting its long-established nature.