The planet formerly was an Earth Federation colony that broke away during the Sol Gamma Wave in 2601. It later was conquered by the Republic during the Annexation of the Western Territories in 2743, the Republic's annexation of the 27 independent colony worlds that dominated the space to its galactic west.
The planet rebelled during the Lovejoy Revolution and broke away in May 3073 during the Cessation of the Western Territories. It allied with the other rebelling worlds, forming the Western Confederation of Independent Worlds.
The planet is named for Robert Anson Heinlein, an American science fiction writer.