History of the Peloponnesian War

And they, when they had them, sent them away to Athens. When they came thither, the Athenians, fearing Aristeus, lest escaping he should do them further mischief (for he was manifestly the author of all the business of Potidaea and about Thrace), the same day put them all to death, unjudged and desirous to have spoken, and threw them into the pits, thinking it but just to take revenge of the Lacedaemonians that began it and had slain and thrown into pits the merchants of the Athenians and their confederates whom they took sailing in merchant ships about the coast of Peloponnesus. For in the beginning of the war, the Lacedaemonians slew as enemies whomsoever they took at sea, whether confederates of the Athenians or neutral, all alike.

About the same time, in the end of summer, the Ambraciotes, both they themselves and divers barbarian nations by them raised, made war against Argos of Amphilochia and against the rest of that territory.

The quarrel between them and the Argives arose first from hence.

This Argos and the rest of Amphilochia was planted by Amphilochus the son of Amphiaraus after the Trojan war, who, at his return, misliking the then state of Argos, built this city in the Gulf of Ambracia and called it Argos after the name of his own country.