The Quellor sector represented a specific sector situated within the Colonies region of the galaxy. Notably, it encompassed the Cato Neimoidia system, which housed the Neimoidian colony world known as Cato Neimoidia. Throughout the Clone Wars period, the Galactic Republic and the Confederacy of Independent Systems engaged in repeated conflicts to establish dominance over the planet, examples being the defense of Cato Neimoidia and the Battle of Cato Neimoidia.
The initial naming of the Quellor sector occurred in the reference publication titled Ultimate Star Wars, which saw its release in the year 2015.