The Congress at the Isthmus of Corinth took place in 481 BC, under the presidency of Sparta, and brought together a number of the Greek city states. The Congress agreed to the end of the war between Athens and Aegina. The Congress also discussed the threat from the Persians. Athens was unwilling to place her forces under Sparta and its King Leonidas.
Finally, Athenian archon and political leader, Themistocles, agreed that Athens' navy serve under a Spartan admiral to achieve the unity of the Greek states. In an environment where the Greeks were continually breaking into factions within cities and creating rivalries between cities, Themistocles actions were advanced and far-sighted.