The First Galactic Empire, better known as the Galactic Empire or simply the Empire, was the government formed by Supreme Chancellor Palpatine in 19 BBY, reorganized from the Galactic Republic to bring the Sith into power over the galaxy once more. This move was brought about by the devastation and turmoil caused by the Clone Wars, with events like Order 66 and the Great Jedi Purge and Darth Vader's Mission to Mustafar.(Star Wars Episode III: Revenge of the Sith)

The Rebel Alliance renounced the Empire and fought to free the galaxy form it as one of the main issues was a strong xenophobia. The Emperor held power through the Imperial Army and the Imperial Navy, composed of Stormtroopers and Star Destroyers. The Imperial Senate used burrecracy to maintain power until it was dissolved in 0 ABY, when Palpatine attempted to use the Death Star I to keep star systems in line through fear.

When the Emperor was killed in 4 ABY, Imperial forces regrouped into the Imperial Remnant under Grand Admiral Thrawn and fled to the Unknown Regions of the galaxy. The Empire was later reformed into the Second Imperium under a holographic Palpatine created by four Imperial Royal Guards.(Star Wars: The Original Trilogy, Heir to the Empire, The Rise of the Shadow Academy)

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