Kostroma was a planet in the eponymous star system in the influence sphere of the Republic of Cinnabar.
It was the main planet of the Commonwealth of Kostroma.
It was neutral in the conflict between Cinnabar and the Alliance of Free Stars, but the Reciprocity Agreement allowed Cinnabar starships to land on the surface.
Kostroma was ruled by the Elector, an autocratic office that the many clans of the planet violently fought over. (RCN1)