History of the Peloponnesian War

Upon receiving this message and discovering that the Athenians, far from being privy to the Boeotian alliance, were involved in a serious quarrel with the Lacedaemonians, the Argives paid no further attention to the embassy which they had just sent to Lacedaemon on the subject of the treaty, and began to incline rather towards the Athenians, reflecting that, in the event of war, they would thus have on their side a city that was not only an ancient ally of Argos, but a sister democracy and very powerful at sea.

They accordingly at once sent ambassadors to Athens to treat for an alliance, accompanied by others from Elis and Mantinea.

At the same time arrived in haste from Lacedaemon an embassy consisting of persons reputed well disposed towards the Athenians—Philocharidas, Leon, and Endius, for fear that the Athenians in their irritation might conclude alliance with the Argives, and also to ask back Pylos in exchange for Panactum, and in defence of the alliance with the Boeotians to plead that it had not been made to hurt the Athenians.