History of the Peloponnesian War

About the same time, when the summer was drawing to a close, the Ambraciots, with their own forces and many of the barbarians whom they had raised, made an expedition against Argos in Amphilochia, and the rest of that country.

Now their enmity against the Argives first arose from the following circumstances.

Argos in Amphilochia and The rest of the country was colonized by Amphilochus the son of Amphiaraus, when he returned home after the Trojan war, and was not pleased with the state of things at Argos;

[and he built it] on the Ambracian Gulf, and called it Argos after the name of his own country.