During the time of the Galactic Empire's reign, known as the Age of the Empire, a secret prison facility was maintained by the Empire on the Hyborean Moon. Romwell Krass Junior, an Agent of the Imperial Security Bureau, viewed this assignment favorably, even going so far as to have his acquaintances reassigned to the site. After the events of the Battle of Endor, the New Republic launched an attacked against the Hyborean Moon. New Republic forces then assaulted the prison complex, compelling Romwell Krass to escape the planet.