Romulan Guard

The Romulan Guard, commonly known as the Romulan Imperial Fleet, Imperial Armada and as the Imperial Star Navy, is the military and primary space force of the Romulan Star Empire. The Romulan Guard operates fleets of Romulan warbirds, and has often been at the forefront of the Star Empire's contacts with the Klingon Empire and United Federation of Planets. (Serpents Among the Ruins, et al.)

During the Dominion War, the Romulan Guard participated in the First Battle of Chin'toka, the Second Battle of Chin'toka, the Battle of Cardassia and many other encounters with the Dominion. The flagships of the Imperial Fleet included the IRW D'ridthau and the IRW Rovaran. (Star Trek: Deep Space Nine, Star Trek: Customizable Card Game)

In 2380, the Romulan Guard was divided between those forces loyal to the new Praetor, Tal'Aura, and those loyal to Commander Donatra, commanding officer of the IRW Valdore. The segments of the Imperial Fleet loyal to Donatra later captured Archernar Prime and several other farming worlds, providing the military of the newly-declared Imperial Romulan State. (Articles of the Federation.)