The Imperator functioned as a Victory-class Star Destroyer serving within the ranks of the Imperial Navy. In the year 6 ABY, as the New Republic launched their offensive aimed at seizing control of Coruscant, gathered intelligence pointed to the presence of a Star Destroyer, specifically the Imperator, as a component of the defensive forces protecting the Galactic capital. Despite its reputation as a capable vessel, the composition of the Coruscant defensive squadron, seemingly consisting solely of Victory-class Star Destroyers, implies that the Imperator was also a member of this class of smaller, more antiquated Star Destroyers.
Prior to the New Republic assault, Ysanne Isard dispatched the Imperator, in conjunction with a vessel known as Emperor's Will, from Coruscant with the mission of establishing preparations for relocating the central authority of the Galactic Empire to a different world. As a matter of fact, the Imperator underwent a transfer to the Black Sword Command, resulting in its acquisition by the Yevethans.