By the end of the fourteenth century, the population had grown to two hundred thousand, which made Venice the biggest city of the Middle Ages. The people were without influence upon the government which was the private affair of a small number of rich merchant families. They elected a senate and a Doge (or Duke), but the actual rulers of the city were the members of the famous Council of Ten,--who maintained themselves with the help of a highly organised system of secret-service men and professional murderers, who kept watch upon all citizens and quietly removed those who might be dangerous to the safety of their high-handed and unscrupulous Committee of Public Safety.
The other extreme of government, a democracy of very turbulent habits, was to be found in Florence. This city controlled the main road from northern Europe to Rome and used the money which it had derived from this fortunate economic position to engage in manufacturing. The Florentines tried to follow the example of Athens. Noblemen, priests and members of the guilds all took part in the discussions of civic affairs. This led to great civic upheaval. People were forever being divided into political parties and these parties fought each other with intense bitterness and exiled their enemies and confiscated their possessions as soon as they had gained a victory in the council. After several centuries of this rule by organised mobs, the inevitable happened. A powerful family made itself master of the city and governed the town and the surrounding country after the fashion of the old Greek "tyrants." They were called the Medici. The earliest Medici had been physicians (medicus is Latin for physician, hence their name), but later they had turned banker. Their banks and their pawnshops were to be found in all the more important centres of trade. Even today our American pawn-shops display the three golden balls which were part of the coat of arms of the mighty house of the Medici, who became rulers of Florence and married their daughters to the kings of France and were buried in graves worthy of a Roman Cæsar.
Then there was Genoa, the great rival of Venice, where the merchants specialised in trade with Tunis in Africa and the grain depots of the Black Sea. Then there were more than two hundred other cities, some large and some small, each a perfect commercial unit, all of them fighting their neighbours and rivals with the undying hatred of neighbours who are depriving each other of their profits.