History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
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.