- This article is about the event. For the novel, see Fortress Republic (novel).
Fortress Republic was the name given to a plan formed by Devlin Stone and carried out by Exarch Jonah Levin to help preserve the Republic of the Sphere from the outside forces that threatened to destroy it. The plan called for the complete withdrawal of all remaining Republic forces to behind a border that roughly encompassed the outline of the Republic's Prefecture X (the capital prefecture containing Terra). In addition to this withdrawal, any attempts at contacting the new Republic would be met with hostility, including the destruction of any ships that crossed the border into the territory.
This law had the effect of sealing off the entire Prefecture, abandoning the remaining Republic worlds to foreign powers (although a reconquest of the old territory was planned as part of Fortress Republic).