Kessel, originally known as Xo’s Eye while under Xim’s empire, was a planet located in the Kessel sector, in the Outer Rim Territories, near Hutt Space and the dangerous celestial bodies of the Maw. It was a prison world, and was home to the galaxy’s largest spice mining operation. Under Imperial rule, slave labor was in extensive use.
Kessel was the only source of glitterstim spice, a valuable drug used both therapeutically and recreationally. The prison was controlled by Imperial Warden Commander Dewt Kluskine. Several prisoners rose to positions of power under him as trustees. The most powerful of these was Moruth Doole, who gained effective control of the spice trade by manipulating the Warden’s accounts. Doole engineered the assassination of Kluskine by a Wookiee prisoner named Gyylghrard, and eventually seized control of the mines himself.
The surface of Kessel. The Galactic Republic administered programs to educate inmates on how to re-enter society upon release. Prior to the Clone Wars, Kassar Forge was one such teacher in this program. Even after the inmates took control of the planet, he voluntarily remained on the moon, eventually marrying Myda, one of the former inmates, and having multiple sons and daughters, including future Rogue Squadron pilots Lujayne and Inyri.
Shortly after the execution of Order 66, a small Jedi conclave was called in one of the abandoned mines of Kessel by Shadday Potkin in a futile attempt to lure Darth Vader into a deathtrap. The plan ultimately failed and all the Jedi who attended were killed.