Anacyclosis

The political doctrine of anacyclosis (or anakyklosis from Greek: ἀνακύκλωσις) is a cyclical theory of political evolution. The theory of anacyclosis is based upon the Greek typology of constitutional forms of rule by the one, the few, and the many. Anacyclosis states that three basic forms of "benign" government (monarchy, aristocracy, and democracy) are inherently weak and unstable, tending to degenerate rapidly into the three basic forms of "malignant" government (tyranny, oligarchy, and ochlocracy).

According to the doctrine, "benign" governments have the interests of all at heart, whereas "malignant" governments have the interests of a select few at heart. However, all six are considered unworkable because the first three rapidly transform into the latter three due to political corruption.

The idea of anacyclosis influenced theorists of republicanism. Some of them, including Aristotle, Cicero, Machiavelli, Vico and Kant suggested that mixed government might help to stabilize republics and prevent permanent anacyclosis.