A sister republic (French: république sœur) was a republic established by French armies or by local revolutionaries and assisted by the First French Republic during the French Revolutionary Wars. These republics, though nominally independent, relied heavily on France for protection, making them more akin to autonomous territories rather than independent states. This became particularly evident after the declaration of the French Empire, when several states were annexed, and the remaining turned into monarchies ruled by members of the Bonaparte family.
The French Revolution was a period of social and political upheaval in France from 1789 until 1799. The Republicans who overthrew the monarchy were driven by ideas of popular sovereignty, rule of law and representative democracy. The Republicans borrowed ideas and values from Whiggism and Enlightenment philosophers. The French Republic supported the spread of republican principles in Europe, but most of these sister republics became a means of controlling occupied lands as client regimes through a mix of French and local power.