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.
We became allies, however, not to the Athenians for the enslaving of the Greeks, but to the Greeks for their liberation from the Mede. And so long as they led us on equal terms, we followed them heartily;
but when we saw them relaxing in their hostility to the Mede, and [*]( Or, as Poppo takes it, bringing on the subjugation. ) undertaking to enslave the Greeks, we were no longer without alarm.
Being incapable, however, through the number of those who had votes, to join together and defend themselves, the allies were reduced to slavery, except ourselves and the Chians; but we joined their enterprises as independent, forsooth, and free-in name. And now we had no longer in the Athenians such leaders as we could trust, having before us the examples that were already given: