Admiral Valdore was a high-ranking official in the Romulan military in the 22nd century.
Early in his career, Valdore served as a senator in the Romulan Senate, where he once considered Senator Vrax a friend. Valdore made the mistake of challenging the precept of unlimited expansion. Upon asking the question, "Is conquest truly the best course for our people?", he was expelled from the Senate. From that point on, he vowed never to repeat his error nor forget his birthright as a soldier of the Empire. (ENT: "The Aenar")
In November of 2154, he oversaw a plan to use a drone ship – capable of disguising itself holographically – to destabilize relations between the Andorians, the Tellarites, and many other species in a certain region of space. The project was backed by Senator Vrax.
The drone ship was controlled from Romulus and piloted via telepresence by the Aenar Gareb, who had been abducted for this purpose. When the drone ship was boarded by Commander Tucker and Lieutenant Reed of Enterprise NX-01, Valdore attempted to coerce them into complying by irradiating the vessel. Tucker was injured by the radiation, but Reed sabotaged the drone ship by setting a phase-pistol on overload on its bridge. The resulting explosion significantly damaged the drone ship. Subsequently, Tucker and Reed were rescued by Enterprise. As the drone ship plan began to unravel, Vrax threatened Valdore with his Reman bodyguards.
Later, Valdore ordered Gareb to control two drone ships simultaneously. When Gareb was telepathically contacted by his sister Jhamel, he disobeyed his Romulan captors and used one drone ship to destroy the other. In response, Valdore shot Gareb in the neck with a disruptor pistol.
Valdore's project was a complete failure because its result was exactly opposite of that which was intended. Under the leadership of Captain Jonathan Archer, the Tellarites, Andorians, Humans, and Vulcans came together to locate and destroy the drone ship. This temporary alliance sowed the seeds for the formation of the United Federation of Planets. (ENT: "Babel One", "United")
By the 24th century, the Warbird Valdore and Valdore type was named for the Admiral. (Star Trek Nemesis)
