Depending on who you ask this word would mean different things. In a rebels eyes they are in the right and are often fighting for freedom. "Kendovvesestin" "warriors of freedom" would work from this perspective. But in the current rulers eyes they are traitors and would probably call them something like "muzsetahrovin" "men of treachery".

Some suggestions I can think of:

goraan rel (new rule), goraan junaar (new kingdom)

vokrii do kul rel (return of the right rule)