THE CONFEDERACY OF DELOS (477 B.C.).--In order that they might be able to carry on the war more effectively against the Persians, the Ionian states of Asia Minor, the islands of the Ægean, and some of the states in Greece proper, shortly after the battle of Platæa, formed themselves into what is known as the Confederacy of Delos. Sparta, on account of her military reputation, had hitherto been accorded the place of pre-eminence and authority in all such alliances of the Hellenic cities. She had come, indeed, to regard herself as the natural guardian and leader of Greece. But at this time the unbearable arrogance of the Spartan general Pausanias, who presumed upon the great reputation he had gained at the battle of Platæa, led the states which had entered into the alliance to look to Athens to assume the position of leadership in the new confederacy. The lofty character of Aristides, who was now the most prominent Athenian leader, and his great reputation for fairness and incorruptible integrity, also contributed to the same result. He was chosen the first president of the league (477 B.C.), and the sacred island of Delos was made the repository of the common funds. What proportion of the ships and money needed for carrying out the purposes of the union should be contributed by the different states, was left entirely to the decision of Aristides, such was the confidence all had in his equity; and so long as he had control of the matter, none of the members of the alliance ever had cause of complaint. Thus did Sparta lose, and Athens gain, the place of precedence among the Ionian states. The Dorian states of the Peloponnesus, in the main, still looked to Sparta as their leader and adviser. All Greece was thus divided into two great leagues, under the rival leadership of Sparta and Athens. THE ATHENIANS CONVERT THE DELIAN LEAGUE INTO AN EMPIRE.--The Confederacy of Delos laid the basis of the imperial power of Athens. The Athenians misused their authority as leaders of the league, and gradually, during the interval between the formation of the union and the beginning of the Peloponnesian War, reduced their allies, or confederates, to the condition of tributaries and subjects. Athens transformed the league into an empire in the following manner. The contributions assessed by Aristides upon the different members of the confederation consisted of ships and their crews for the larger states, and of money payments for the smaller ones. From the first, Athens attended to this assessment matter, and saw to it that each member of the league made its proper contribution. After a while, some of the cities preferring to make a money payment in lieu of ships, Athens accepted the commutation, and then building the ships herself, added them to her own navy. Thus the confederates disarmed themselves and armed their master.