History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
The following winter the ephors who[*](421-420 B.C.) happened to be in office at Sparta were other than those under whom the treaty had been made, and some of them were even opposed to it. Embassies had come from their allies, and there were present also Athenians, Boeotians, and Corinthians; and after much discussion, without coming to an agreement, as the envoys were on the point of departing for home, Cleobulus and Xenares, the ephors who most desired to annul the treaty, made private proposals to the Boeotians and Corinthians, advising them to adopt as far as possible the same policy, and that the Boeotians should first become allies of the Argives and then try to make the Argives along with themselves allies of the Lacedaemonians. For in this way the Boeotians would be least likely to be forced to come into the treaty with Athens, since the Lacedaemonians would prefer gaining the friendship and alliance of the Argives, counting that more important than the enmity of the Athenians and the disruption of the treaty. For they knew that the Lacedaemonians were always desirous that Argos should be friendly to them on fair terms, thinking that war outside of the Peloponnesus would then be an easier matter
for them. Panactum, however, they begged the Boeotians to give up to the Lacedaemonians, in order that they might, if possible, get back Pylos in exchange for it, and so be in a safer position for renewing the war with the Athenians.
The Boeotians and Corinthians, being charged by Xenares and Cleobulus and the Lacedaemonians that were friendly to them with these instructions, which they were to announce to their governments, now returned to their respective cities.
But two Argive men of highest official position, who were watching for them by the way as they went off, joined them and made a proposal to them, in the hope that the Boeotians might become allies to them, just as the Corinthians, Eleans, and Mantineans had done; for they thought, if this succeeded, they might then readily, all pursuing a common policy, carry on war or make peace with the Lacedaemonians, if they should wish, or with anyone else with whom it might be necessary.