Polybius' theory of anacyclosis is the most sophisticated theory of political (r)evolution to have emerged from ancient Greek and Roman political thought. ------------------ To watch the highlight real from the last AGD tour in Greece, click here. ------------------ To read the passage in Polybius where he discusses anacyclosis click here. ------------------ 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 Anacyclosis, Act 2: The Rise of Republics Anacyclosis, Act 3: The Rise and Fall of Democracy