An Executor-class Star Dreadnought produced after the Battle of Endor (7 ABY), HIMS Palpatine was constructed in addition to the four remaining dreadnoughts already in service to serve as Bacharan Valak's flagship.
Palpatine was assigned to the Imperial 1st Fleet and made the Emperor's personal commandship. Palpatine would be at the forefront of Valak's campaign across the galaxy initiated in 8 ABY, but with the capture of Coruscant in 9 ABY, the Palpatine fell more into a reserve role, either lurking about Dreven or Selene.
Palpatine would be called to the front lines one more time under Valak's rule, to lead the campaign in the Imperial Civil War. It underwent a name change, however, to HIMS Invidious, and served as the flagship for the Imperial Navy throughout the war.
After Valak's abdication, the dreadnought fell into the hands of Emperor Kendal Osbourne, who changed the name to HIMS Dark Eminence, and chose it as his flagship. Dark Eminence would lead the Imperial fleet at the Battle of Kappa and later at the Battle of Bothawui, where it received heavy damage.
It would not take long for Dark Eminence to be replaced, however, by the equally powerful HIMS Malevolence.