The Aetolians border on the western Locrians; and the Aenianians who inhabit Mount Oeta border on the Epicnemidian Locrians; and in the middle between them are Dorians.1
Now these Dorians are the people who inhabited the Tetrapolis, which, they say, was the metropolis of all the Dorians; and the cities they held were Erineus, Boeum, Pindus and Cytinium. Pindus is situated above Erineus; and a river bearing the same name flows past it, emptying into the Cephissus not very far from Lilaea. By some, however, Pindus is called Acyphas. The king of these Dorians was Aegimius, who was driven from his throne, but was brought back again, as the story goes, by Heracles; accordingly, Aegimius requited the favor to Heracles after the latter's death on Oeta; for he adopted Hyllus, the eldest of the sons of Heracles; and Hyllus and his descendants became his successors on the throne. From here it was that the Heracleidae set out on their return to the Peloponnesus.