Sate Pestage, originally a minor antagonist in The Empire Strikes Back and a foil for Darth Vader, was a longtime advisor of Emperor Palpatine, being one of the few people who truly knew him. Serving Palpatine since his days as Senator of Naboo, Pestage advanced to advisor to the Galactic Republic Supreme Chancellor, and then to Grand Vizier of the Galactic Empire.
Following the deaths of Palpatine and Darth Vader at Endor, Pestage was the logical successor as Emperor. The Grand Vizier assumed control of Coruscant and became the interim Emperor. However, Ysanne Isard turned on him, along with many other Imperial leaders. To save his life, Pestage made a deal with the New Republic to turn over Coruscant in exchange for immunity. Isard eventually apprehended Pestage, and the Grand Vizier was executed by Admiral Delak Krennel.