Starfleet records: Romulan Neutral Zone. History: Earth-Romulan War. The Earth-Romulan War, was a major interstellar conflict fought from 2156 to 2160 between the forces of United Earth and those of the Romulan Star Empire. Its conclusion, which was marked by an Earth/Andorian/Vulcan/Tellarite alliance decisively defeating the Romulans at the Battle of Cheron, led to the establishment of the Romulan Neutral Zone and immediately preceded the incorporation of the United Federation of Planets. Sour

Starfleet records. History. Romulan-Klingon relations: 2267: The Klingon Empire and the Romulan Star Empire, along with the Federation, jointly establish a colony on Nimbus III, officially declaring it "the planet of galactic peace". Source: Star Trek V: The Final Frontier. Star Trek. Live the experience. | Starfleet Command