ISS Imperator

In the "Mirror Universe", ISS Imperator was a four-nacelled dreadnaught in service to the Terran Empire's Starfleet. The most powerful warship built by the Terran Empire, the Imperator was the first ship and last of its class, as rebel forces attacked the Antares shipyards shortly after the ship's launch. It had been intended as the new flagship, but was deemed "too big and too ugly" by the Emperor.

In 2154, the Imperator was under the command of Captain A.G. Robinson, and was one of seven ships that attempted to defend Earth from an attack by Empress Hoshi Sato aboard the USS Defiant. The Imperator was crippled in the battle, and the crew subsequently pledged their loyalty to Empress Sato. (ENT novel: Age of the Empress)