ペロポネソス同盟
Cleomenes then proposed an expedition of the entire Peloponnesian League, with himself and his co-King Demaratos in command and the aim of setting up Isagoras as tyrant of Athens. The specific aims of the expedition were kept secret. The secrecy proved disastrous and as dissension broke out the real aims became clearer. First the Corinthians departed. Then a row broke out between Cleomenes and Demaratos with Demaratos too, deciding to go home. As a result of this fiasco the Spartans decided in future not to send out an army with both Kings at its head. It also seems to have changed the nature of the Peloponnesian League. From that time, major decisions were discussed. Sparta was still in charge, but it now had to rally its allies in support of its decisions.