History of the Peloponnesian War

At the end of the same summer the Corinthian Aristeus, Aneristus, Nicolaus, and Pratodamus, envoys from Lacedaemon, Timagoras, a Tegean, and a private individual named Pollis from Argos, on their way to Asia to persuade the king to supply funds and join in the war, came to Sitalces, son of Teres in Thrace, with the idea of inducing him, if possible, forsake the alliance of Athens and to march on Potidaea then besieged by an Athenian force, and also of getting conveyed by his means to their destination across the Hellespont to Pharnabazus, who was to send them up the country to the king.

But there chanced to be with Sitalces some Athenian ambassadors, Learchus, son of Callimachus, and Ameiniades, son of Philemon, who persuaded Sitalces' son, Sadocus, the new Athenian citizen, to put the men into their hands and thus prevent their crossing over to the king and doing their part to injure the country of his choice.