Polybius' theory of anacyclosis is the most sophisticated theory of political (r)evolution to have emerged from ancient Greek and Roman political thought.
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To watch the highlight real from the last AGD tour in Greece, click here.
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To read the passage in Polybius where he discusses anacyclosis click here.
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If you'd like to read more about the theory of anacyclosis, I've written a few blogs on the subject:
Anacyclosis, Act 1: From Monarchy to Tyranny
