History of the Peloponnesian War

for the Corinthians were now openly at variance with them, and Perdiccas son of Alexander, king of the Macedonians, who had before been an ally and friend, had now become hostile.

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;