While the Athenians were rebuilding their city, important events were taking place in the Aegean. After the battle of Mycale the Greek states in Asia Minor and on the islands once more rose in revolt against the Persians. Aided by Sparta and Athens, they gained several successes and removed the immediate danger of another Persian attack. It was clearly necessary, however, for the Greek cities in Asia Minor and the Aegean to remain in close alliance with the Continental Greeks, if they were to preserve their independence. Under the guidance of Aristides, the old rival of Themistocles, [9] the allies formed a union known as the Delian League. [Illustration: "THESEUM" An Athenian temple formerly supposed to have been constructed by Cimon to receive the bones of the hero Theseus. It is now believed to have been a temple of Hephaestus and Athena erected about 440 B.C. The 'Theseum' owes its almost perfect preservation to the fact that during the Middle Ages it was used as a church.] CONSTITUTION OF THE LEAGUE The larger cities in the league agreed to provide ships and crews for a fleet, while the smaller cities were to make their contributions in money. Athens assumed the presidency of the league, and Athenian officials collected the revenues, which were placed in a treasury on the island of Delos. As head of this new federation Athens now had a position of supremacy in the Aegean like that which Sparta enjoyed in the Peloponnesus. [10] CIMON AND THE WAR AGAINST PERSIA The man who succeeded Themistocles and Aristides in leadership of the Athenians was Cimon, son of Miltiades, the hero of Marathon. While yet a youth his gallantry at the battle of Salamis gained him a great reputation, and when Aristides introduced him to public life the citizens welcomed him gladly. He soon became the head of the aristocratic or conservative party in the Athenian city. To Cimon the Delian League entrusted the continuation of the war with Persia. The choice was fortunate, for Cimon had inherited his father's military genius. No man did more than he to humble the pride of Persia. As the outcome of Cimon's successful campaigns the southern coast of Asia Minor was added to the Delian League, and the Greek cities at the mouth of the Black Sea were freed from the Persian yoke. Thus, with Cimon as its leader, the confederacy completed the liberation of the Asiatic Greeks. THE DELIAN LEAGUE BECOMES SUBJECT TO ATHENS, ABOUT 454 B.C.