History of the Peloponnesian War

Those Samians that had risen against the nobility and were of the people's side, turning when Pisander came thither at the persuasion of him and of those Athenians in Samos that were his accomplices, conspired together to the number of three hundred and were to have assaulted the rest as popular.

And one Hyperbolus, a lewd fellow, who, not for any fear of his power or for any dignity, but for wickedness of life and dishonour he did the city, had been banished by ostracism, they slew, abetted therein both by Charminus, one of the commanders, and by other Athenians that were amongst them, who had given them their faith. And together with these, they committed other facts of the same kind, and were fully bent to have assaulted the popular side.

But they, having gotten notice thereof, made known the design both to the generals, Leon and Diomedon (for these, being honoured by the people, endured the oligarchy unwillingly), and also to Thrasybulus and Thrasyllus, whereof one was captain of a galley and the other captain of a band of men of arms, and to such others continually as they thought stood in greatest opposition to the conspirators; and required of them that they would not see them destroyed and Samos alienated from the Athenians by the only means of which their dominion had till this time kept itself in the state it is in.