The Bylluran system, situated within the Grumani sector of the Outer Rim Territories, was a star system. The planet of Byllura resided within this system, and during the era of the Republic Dark Age, it functioned as the capital planet for the Dyarchy. This Sith realm was governed by the youthful Sith Lords Dromika and Sith. Around 1032 BBY, a battle occurred over Byllura between the forces of the Arkadianate Sith state and the Dyarchy Fleet, ultimately resulting in the Arkadianites gaining control of the planet.
Originally, the reference book The Essential Atlas from 2009, authored by Jason Fry and Daniel Wallace, located this system in the M-17 grid square.