Canis Minoris XII was a planet located somewhere in the space of the galaxy's Beta Quadrant, the twelfth planet in orbit of the Canis Minoris star system. The Coalition starship USS Runemark faced down a vessel of the Romulan Star Empire at Canis Minoris XII during the Earth-Romulan War. On reference stardate 0101.28, the Runemark was destroyed after a running battle with a Romulan-crewed U4-class cruiser. Despite the Runemark's destruction at Canis Minoris XII, the Zoenamy-class vessel's Centauran crew were successful in severely damaging the Romulan ship. (FASA RPG module: The Romulan War)