Very soon the restraints which Athens imposed upon her allies became irksome, and they began to refuse, one after another, to pay the assessment in any form. Naxos, one of the Cyclades, was the first island to secede, as it were, from the league (466 B.C.). But Athens had no idea of admitting any such doctrine of state rights, and with her powerful navy forced the Naxians to remain within the union, and to pay an increased tribute. What happened in the case of Naxos happened in the case of almost all the other members of the confederation. By the year 449 B.C. only three of the island members of the league still retained their independence. Even before this date (probably about 457 B.C.) the Athenians had transferred the common treasury from Delos to Athens, and diverting the tribute from its original purpose, were beginning to spend it, not in the prosecution of war against the Barbarians, but in the execution of home enterprises, as though the treasure were their own revenue. Thus what had been simply a voluntary confederation of sovereign and independent cities, was converted into what was practically an absolute monarchy, with the Attic democracy as the imperial master. What made this servitude of the former allies of Athens all the more galling was the fact that they themselves had been compelled to forge the very chains which fettered them; for it was their money that had built and was maintaining the fleet by which they were kept in subjection and forced to do whatever might be the will of the Athenians. THE LEADERSHIP OF CIMON; HIS OSTRACISM.--One of the ablest and most popular of the generals who commanded the forces of the Athenians during this same period when they were enslaving their confederates, was Cimon, the son of Miltiades. He was one of those whose spirits had been fired by the exciting events attendant upon the Persian invasion. He had acquired a certain reputation, at the time of the abandonment of Athens, by being the first to hang up his bridle in the sanctuary of the Acropolis, thus expressing his resolution to place all his confidence in the fleet, as Themistocles advised.