In the beginning there is a Kingdom. The King is fair and leads his people, thus he became a king. But as time passes, heirs of that King start becoming cruel and despotic, so the best ones from tehir blood, the noblemen, stand up and fight that. Once they throw out the King, they institute a government of them, which again gets as time goes by corrupted and turns into an oligarchy. At that time, the population can't stand it any more and make their own revolution. The democracy is born. Yet the democracy is the government of the majority, and the majority are idiots, uneducated or simply worthless. Thus they soon fall in the hands of the demagogues, and there comes a time when one of the demagogues, more skilled than others, manages to seize the whole power and start a dictatorship. And if enough time goes by, that dictator may even legitimate himself as a monarch, choosing his heir.
Those are not my words. It's from Aristotle, 300+ years B.C.
