Venaster was a male Romulan who lived in the 24th century. Venaster was once a member of the Romulan military but later became a member of Spock's Reunification Movement.
In 2381, Venaster accompanied Spock and D'Tan to take Angarraken to Romulan Security. (ST - Typhon Pact novel: Rough Beasts of Empire)
In 2382, Venaster reported to Spock and the other members of the Reunification Movement of the protests taking place against their group. (ST - Typhon Pact novel: Plagues of Night)