History of the Peloponnesian War

And he had become hostile because the Athenians had made an alliance with his brother Philip and with Derdas, who were making common cause against himself.

Alarmed at this he kept sending envoys to Lacedaemon, trying to bring about a war between Athens and the Peloponnesians. He sought also to win over the Corinthians, with a view to the revolt of Potidaea;