History of the Peloponnesian War

While both parties were carrying out these measures, and engaged in preparation for the war, just as when they were commencing it, the Euboeans, first of all, sent during this winter an embassy to Agis, to treat of their revolting from the Athenians. He acceded to their proposals, and sent for Alcamenes son of Sthenelaidas, and for Melanthus, to come from Sparta and take the command in Euboea. Accordingly they came with about three hundred of the Neodamodes, and he began to prepare for their crossing over.

But in the mean time some Lesbians also came to him; for they, too, wished to revolt. And as the Boeotians supported their application, Agis was persuaded to defer acting in the cause of Euboea, and made preparations for the revolt of the Lesbians, giving them Alcamenes as a commander, who was to sail to Euboea; while the Boeotians promised them ten ships, and Agis the same number.

These measures were undertaken without the authority of the Lacedaemonian state; for as long as Agis was at Decelea, and his forces with him, he had power both to send troops to whatever quarter he pleased, and to levy soldiers and money. And at this time the allies obeyed him, one might say, much more than the Lacedaemonians in the city: for he was feared, because he went every where in person with a force at his command. He, then, furthered the views of the Lesbians. The Chians and Erythraeans, on the other hand, who were also ready to revolt, made their application, not to Agis, but at Sparta.