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Wellsprings
politics

The Cycle of Constitutions

ἀνακύκλωσις

Every good government rots into its evil twin, then into the next regime — and round the wheel turns again.

Polybius, a Greek historian of the second century BCE, developed the theory of anacyclosis—the idea that constitutions naturally cycle through a predictable sequence of forms. Starting from kingship, they degenerate into tyranny, then transform into aristocracy, which becomes oligarchy, before eventually giving way to democracy and finally mob rule. From this lowest point, the cycle begins anew. Polybius saw this rotation not as a flaw but as an inevitable pattern driven by human nature and political dynamics.

This cyclical view had real implications for how Polybius evaluated political stability. Rather than seeking a perfect permanent constitution, he argued that Rome's mixed government—blending monarchic, aristocratic, and democratic elements—offered the best protection against the cycle by preventing any single form from dominating long enough to degenerate into its corrupt counterpart. By balancing these elements, a state could theoretically interrupt the natural progression toward chaos and extend its prosperity indefinitely.

Where this idea shows up

25 Greek sources

Where to read it