The warbird design referred to as D'deridex-class, B-type warbird, or Warbird class was one of the largest and most powerful mainstays of the Romulan Star Empire. It served as the backbone of the Romulan fleet during the later half of the 24th century.
The D'Deridex-class Romulan Warbird is the same type as seen in Star Trek: The Next Generation, Star Trek: Deep Space Nine, and in episodes of Star Trek: Voyager. Measuring over 1300 meters in length, and easily dwarfing Starfleet's Galaxy-class starships, the D'Deridex-class is one of the largest and most powerful vessels used by the Romulan Star Empire. The D'Deridex-class has been at the forefront of Romulan contact with other species, and acted as battleships during the Dominion War of 2373-2375