The Ronax was a Thereus-class Bird-of-Prey that saw service with the Romulan Star Navy during the 24th century. In 2371, the Ronax ambushed and destroyed a Taurhai scouting wing. This allowed the Romulan fleet to surprise the Taurhai and deal them a heavy defeat in the Battle of the Blue Spiral Nebula. (Ship Recognition Manual, Volume 5: Starships of the Romulan Star Empire)