The Gaulus sector, also known as the Ryloth sector, was a sector of the Outer Rim Territories region of the galaxy. It contained the Ryloth system, the location of the planet Ryloth, which was the site of a battle during the Clone Wars.
Following the rise of the Galactic Empire, a faction of the Twi'lek species native to Ryloth rebelled against the Empire in the Ryloth Insurgency, which led to the Sith Lords Darth Sidious and Darth Vader visiting the world.
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