History of the Peloponnesian War

For except it were the Lacedaemonians, the Chians were the only men that I have heard of that had joined advisedness to prosperity, and the more their city increased, had carried the more respect in the administration thereof to assure it.

Nor ventured they now to revolt (lest any man should think that, in this act at least, they regarded not what was the safest) till they had many and strong confederates with whose help to try their fortune, nor till such time as they perceived the people of Athens (as they themselves could not deny) to have their estate after the defeat in Sicily reduced to extreme weakness. And if through human misreckoning they miscarried in aught, they erred with many others, who in like manner had an opinion that the state of the Athenians would quickly have been overthrown.

Being therefore shut up by sea, and having their lands spoiled, some within undertook to make the city return unto the Athenians. Which though the magistrates perceived, yet they themselves stirred not; but having received Astyochus into the city with four galleys that were with him from Erythraea, they took advice together, how by taking hostages, or some other gentle way, to make them give over the conspiracy. Thus stood the business with the Chians.