The Kessel system was first mentioned in The Hutt Gambit, written by A. C. Crispin (1997). Shortly after this publication, the computer game Star Wars: Rebellion (1998) placed Kessel in the Calaron sector. Rebellion made a number of arbitrary placements of planets for game-play purposes; consequently, Leland Chee, Keeper of the Holocron, has stated that when its placements conflict with existing canon placements, they are overridden.[5] It's placement of Kessel is one such example to which this ruling applies.