The IRW Terix was a Romulan Star Empire D'deridex-class warbird that saw service during the 24th century. In 2370, the Terix was commanded by Commander Sirol. The Terix discovered a fragment of the USS Pegasus and was tasked with finding the rest of the vessel. However, the USS Enterprise-D was able to locate the Pegasus first and escape with its illegal interphase cloaking device. (TNG: "The Pegasus")