Originally the citizens, assembled in public meeting, elected the Doge, and exercised a right to vote on important political matters; but the great families soon acquired control, and little by little turned the government into an oligarchy. The first great step was taken in Barbarossa's time, just when the Lombard cities were struggling to free themselves from Imperial dominion. A Great Council of four hundred and eighty members was established, to which were given the powers of legislation, appointment, electing the Doge, and filling vacancies in itself. The franchises of the people were all taken away and the oligarchy left supreme. This oligarchy of merchant princes, in whom patriotism, pride of place, and love of gain harmoniously accorded, was an exceedingly competent body of men. The greatness of Venice was their greatness, and they pursued it devotedly. Beginning early in life these patricians were trained for their duties by service in the navy and in the merchant marine, or by employment in the government of the various cities, islands, and territories included in the long stretch of coastwise empire. Knowing that Venice lived by commerce they made every effort by war, diplomacy, and private enterprise, to extend that commerce. After the conquest and division of the Eastern Empire (1204) they became more eager than ever for a monopoly of trade with the Levant, and inevitably came into deadly rivalry with Genoa, also passionately eager to hold the gorgeous East in fee. The wars with Genoa, destructive though they were for the time being, were of service to the aristocracy, for they made the Venetians appreciate the value of a compact governing body; and the aristocracy took advantage of that appreciation to tighten its hold on the government. Throughout the thirteenth century the Great Council, though it consisted entirely, or almost entirely, of patricians and elected its own members, had been open to all classes. Any citizen, however unlikely to be elected, was eligible. At the close of the century the patricians secured the enactment of a series of measures, which in substance divided the citizens into two classes, those whose ancestors had sat in the Great Council, and those whose ancestors had not, and decreed that only members of the first class should be eligible. This legislation is known as the closing of the Great Council. As all those who were eligible naturally wished to become members, the Council gradually increased until it finally numbered over fifteen hundred. The patricians also further curtailed the powers of the Doge, divided the various functions of government among the main subdivisions of the Council,--the Senate, the Council of Forty, the Doge's cabinet, and the Council of Ten,--and gave to the State the definite form of government which it maintained to its end.