political arena. Athens' rule over its alliance Pericles wanted to stabilize Athens' dominance over its alliance and to enforce its pre-eminence in Greece. The process by which the Delian League transformed into an Athenian empire is generally considered to have begun well before Pericles' time, as various allies in the league chose to pay tribute to Athens instead of manning ships for the league's fleet, but the transformation was speeded and brought to its conclusion by Pericles. The final steps in the shift to empire may have been triggered by Athens' defeat in Egypt, which challenged the city's dominance in the Aegean and led to the revolt of several allies, such as Miletus and Erythrae. Either because of a genuine fear for its safety after the defeat in Egypt and the revolts of the allies, or as a pretext to gain control of the League's finances, Athens transferred the treasury of the alliance from Delos to Athens in 454–453 BC. By 450–449 BC the revolts in Miletus and Erythrae were quelled and Athens restored its rule over its allies. Around 447 BC Clearchus proposed the Coinage Decree, which imposed Athenian silver coinage, weights and measures on all of the allies. According to one of the decree's most stringent provisions, surplus from a minting operation was to go into a special fund, and anyone proposing to use it otherwise was subject to the death penalty. It was from the alliance's treasury that Pericles drew the funds necessary to enable his ambitious building plan, centered on the "Periclean Acropolis", which included the Propylaea, the Parthenon and the golden statue of Athena, sculpted by Pericles' friend, Phidias. In 449 BC Pericles proposed a decree allowing the use of 9,000 talents to finance the major rebuilding program of Athenian temples. Angelos Vlachos, a Greek Academician, points out the use of the alliance's treasury, initiated and executed by Pericles, as one of the largest embezzlements in human history; this misappropriation financed, however, some of the most marvellous artistic creations of the ancient world. Samian War The Samian War was one of the last significant military events before the Peloponnesian War. After Thucydides' ostracism, Pericles was re-elected yearly to the generalship, the only office he ever officially occupied, although his influence was so great as to make him the de facto ruler of the state. In 440 BC Samos went to war against Miletus over control