The second period is one of transition--in politics, in literature, in the fine arts. Everywhere the old landmarks are being broken up, and the new ones are not yet fixed. The heroic monarchies yield first of all to oligarchies, and then to tyrannies; the tyrannies in their turn give place to democracies, or to constitutional aristocracies. Argos, the centre of heroic Hellas, is the first to change. Between 770 and 730 B.C. Pheidon usurps the sovereign power, and dies, leaving no dynasty behind him.[3] Between 650 and 500 we find despots springing up in all the chief Greek cities. At Corinth the oligarchical family of the Bacchiadæ are superseded by the tyrants Cypselus and Periander. At Megara the despot Theagenes is deposed and exiled. At Sicyon the Orthagoridæ terminate in the despot Cleisthenes, whose reign is marked by an attempt to supersede the ancient Doric order of government by caste. At Mitylene, Pittacus becomes a constitutional autocrat, or dictator, for the public safety. At Samos, Polycrates holds a post of almost Oriental despotism. At Athens we find the great family of the Pisistratidæ, who supersede the dynastic tyranny in commission of the house of Codrus. What is the meaning of these changes? How does the despot differ from the heroic monarch, who held, as we have seen, his power by divine right, but who also had to depend for his ascendency on personal prowess? Gradually the old respect for the seed of Zeus died out. Either the royal families abused their power or became extinct, or, as in the case of Athens and Sparta, retained hereditary privileges under limitations. During this decay of the Zeus-born dynasties the cities of Greece were a prey to the quarrels of great families; and it often happened that one of these obtained supreme power--in which case a monarchy, based not on divine right, but on force and fear, was founded; or else a few of the chief houses combined against the State to establish an oligarchy. The oligarchies, owing their authority to no true, legal, or religious fount of honor, were essentially selfish, and were exposed to the encroachments of the more able among their own families. The cleverest man in an oligarchy tended to draw the power into his own hands; but in this he generally succeeded by first flattering and then intimidating the people. Thus in one way or another the old type of dynastic government was superseded by despotisms, more or less arbitrary, tending to the tyranny of single individuals, or to the coalition of noble houses, and bringing with them the vices of greed, craft, and servile cruelty. The political ferment caused a vast political excitement. Party strove against party; and when one set gained the upper hand, the other had to fly. The cities of Hellas were filled with exiles. Diplomacy and criticism occupied the minds of men. Personal cleverness became the one essential point in politics. But two permanent advantages were secured by this anarchy to the Greeks.