Cheron
Star Trek: The Next Generation
Episode: TNG 158 - Defector, The
Site of a battle with the United Federation of Planets considered a "humiliating" defeat by the Romulans, according to Admiral Jarok. It led to the creation of the Neutral Zone and thus likely climaxed the original Romulan War in 2160. By coincidence, it is also the planet or namesake sector of the long-dead world where a group of two advanced races destroyed each other over racial bigotry, not encountered by the UFP until 2369.
