the expedition, also encouraged by the other king Demaratus, who opposed Cleomenes. The campaign therefore failed, and as a result Sparta had to concede the creation of a congress of the League, where members could vote on war and peace. It means that before that time, Sparta could call its allies at will without informing them of the purposes of the war. The Peloponnesian League therefore became a bicameral organisation, with two assemblies: the Spartan ecclesia and the congress of the League, both chaired by an ephor. Spartan citizens first debated the matter between them in the ecclesia. If a positive vote was reached in the ecclesia, the congress of the League was called, where the allies debated and voted on Sparta's proposal. Allies' votes were worth exactly the same in the League congress, but Sparta likely did not participate in the vote, since its decision was already made by the ecclesia. League members were bound by the result of the League congress even if they had voted against it. Approval of the congress was necessary to declare a League war or make peace. Several instances of allies rejecting Sparta's proposals in the congress are known. The first of them took place c.504, when Sparta summoned what was perhaps the first congress of the League in order to attack Athens and install Hippias as tyrant, but the allies led by Corinth unanimously rejected it. In 440, Sparta wanted to renew war against Athens, but the allies led by Corinth refused to go to war. These events show the great influence exercised by Corinth within the League, thanks to its strategic position on the Isthmus. Moreover, the Corinthians often opposed Sparta or forced its hand, such as in 421, when they refused to swear the oath required by the Peace of Nicias with Athens in the middle of the Peloponnesian War. Their reason was that they would have infringed on some separate treaties concluded with their Thracian allies. In 396, they might have refused to follow Sparta because one of their temples burnt, which was seen as bad omen. The Corinthians seems to have fully exploited exemptions granted when "gods and heroes" were involved in opposition to League orders. Indeed, as most international decisions were bound by sacred oaths and the Spartans notoriously devout, using religious motives was a good way to avoid League obligations. Other League members are known to