History of the Peloponnesian War

About the same time, as the summer was ending, the Ambraciots themselves, with many of the barbarians whom they had summoned to their standard, made an expedition against the Amphilochian Argos and the rest of Amphilochia.

And enmity between them and the Argives first began from the following circumstance.

Amphilochus son of Amphiaraus, when he returned home after the Trojan war, was dissatisfied with the state of affairs at Argos,[*](Alcmaeon, the elder brother of Amphilochus, had slain their mother Eriphyle (cf. Thuc. 2.102.5). The foundation of Amphilochian Argos is ascribed by other authors (Strabo, vii. 326 c; Apollod. 3. 7) to Alcmaeon or to his son Amphilochus.) and therefore founded Amphilochian Argos on the Ambracian gulf, and occupied the country of Amphilochia, calling the town Argos after the name of his own fatherland.

And this city was the largest in Amphilochia and had the wealthiest inhabitants.