 According to Aristotle, the very first phoros ("that which is brought") was assessed by Aristeides a couple of years after the battle of Salamis.The phoros became a source of contention when it was doubled and trebled by the Athenians to finance the Peloponnesian War.In 454/3, the Delian League treasury was moved to Athens for safe-keeping after the League's defeat in Egypt, although some sources cited it as a pretext on the part of the Athenians to gain control of the league's finances.