Rator IV

Rator IV was the fourth planet of the Rator star system. Rator III and IV formed a twin world, much like Romulus and Remus. 

Location
Rator IV was the fourth planet in the Rator system, itself part of the Hyralan sector and the Psi Velorum sector block, located in the Beta Quadrant. Neither Rator III nor Rator IV possessed moons but orbited their sun together. 

By 2378, the system was less than 10 light-years from the Romulan Neutral Zone. 

Geography
Rator IV was a rocky planet. Its surface was mostly grey and featured black blotches. 

History
The Rator system was part of the Romulan Star Empire since before 2151. In 2388, after the destruction of Romulus, the leaders of the neighbor Rator III attempted to proclaim themselves the new capital of the Romulan Star Empire. The planet's leadership council calling themselves the new Romulan Senate. 

By 2409, Rator Prime was the seat pf Empress Sela. The Tal Shiar kept a fleet of starships in the vicinity and protected the planet with turret emplacements. When Starfleet learned of plans to attack with subspace weapons, SI dispatched a team, to destroy the weapon caches on Prime, and a fleet to destroy the Romulan assault fleet. The Federation fleet was led by the dreadnought USS San Jose. The battle ensued at Rator IV. The Romulan fleet and its flagship, the, were destroyed, and the Romulans were forced to scuttle their attack plans against the Federation.