The IRW Decius was a holographic Romulan D'deridex-class warbird. The starship hologram was created for a holoprogram of a fictional future by Barash for Commander William T. Riker in 2367. In the program, that took place in 2383, the Decius transported Admiral Jean-Luc Picard, Deanna Troi, and Ambassador Tomalak to the USS Enterprise-D to conclude treaty negotiations for an alliance. (TNG: "Future Imperfect")