The Thereus-class was a type of Bird-of-Prey that saw service with the Romulan Star Empire during the 24th century. The class entered service in 2369. (Ship Recognition Manual, Volume 5: Starships of the Romulan Star Empire)

The Thereus was made up of a teardorp-shaped main hull and a forward command hull that had a downward pointing "beak". The warp nacelles were at the end of pylons that connected to the side of the main hull and went straight out to port and starboard.

It was designed as a cross between a scout and a cruiser it had powerful engines, sensors and like all birds-of-prey sophisticated cloaking devices. While its firepower might be relatively lacking the class is designed specifically for rapid decloak and fire maneuvers.

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