Romii was a star with at least one planet, Romii, in its system. According to 23rd century Federation star charts, Romii is close to the Romulan hearthworlds. (TOS episode: "Balance of Terror"; ST - The Lost Era novel: The Art of the Impossible; ST novel: A Singular Destiny) In novels by William Shatner, and the Michael Jan Friedman novel Crossover, Romii is identified as the name of the system containing Romulus and Remus. This is inconsistent with canon, which shows that, on star charts, Romii is a separate entity from Romulus.