The Super Star Destroyer Executor, or "Lady Ex," as she was known by her crew and commander, was the personal flagship of the Lord Darth Vader, the premier command ship of the Imperial Navy, and the first of the Executor-class Star Dreadnought line. Designed by Firmus Piett (LadyVader) and starship engineer Lira Wessex (LadyVader) as a successor to the original Imperial-class Star Destroyer, the Executor, at a monumental 19,000 meters in length, represented the largest traditional warship the galaxy had ever seen by the time of its completion.