History of the Peloponnesian War

But neither thus upon some impeachment of the Helots would they proceed against him but kept the custom which they have in their own cases not hastily to give a peremptory sentence against a Spartan without unquestionable proof. Till at length (as it is reported) purposing to send over to Artabazus his last letters to the king, he was bewrayed unto them by a man of Argilus, in time past his minion and most faithful to him, who, being terrified with the cogitation that not any of those which had been formerly sent had ever returned, got him a seal like to the seal of Pausanias (to the end that if his jealousy were false or that he should need to alter anything in the letter, it might not be discovered) and opened the letter, wherein (as he had suspected the addition of some such clause) he found himself also written down to be murdered.