Passage 2.1.1
ἡ δὲ Κορινθία χώρα μοῖρα οὖσα τῆς Ἀργείας ἀπὸ Κορίνθου τὸ ὄνομα ἔσχηκε. Διὸς δὲ εἶναι Κόρινθον οὐδένα οἶδα εἰπόντα πω σπουδῇ πλὴν Κορινθίων τῶν πολλῶν· Εὔμηλος δὲ ὁ Ἀμφιλύτου τῶν Βακχιδῶν καλουμένων, ὃς καὶ τὰ ἔπη λέγεται ποιῆσαι, φησὶν ἐν τῇ Κορινθίᾳ συγγραφῇ---εἰ δὲ Εὐμήλου γε ἡ συγγραφή---Ἐφύραν Ὠκεανοῦ θυγατέρα οἰκῆσαι πρῶτον ἐν τῇ γῇ ταύτῃ, Μαραθῶνα δὲ ὕστερον τὸν Ἐπωπέως τοῦ Ἀλωέως τοῦ Ἡλίου φεύγοντα ἀνομίαν καὶ ὕβριν τοῦ πατρὸς ἐς τὰ παραθαλάσσια μετοικῆσαι τῆς Ἀττικῆς, ἀποθανόντος δὲ Ἐπωπέως ἀφικόμενον ἐς Πελοπόννησον καὶ τὴν ἀρχὴν διανείμαντα τοῖς παισὶν αὐτὸν ἐς τὴν Ἀττικὴν αὖθις ἀναχωρῆσαι, καὶ ἀπὸ μὲν Σικυῶνος τὴν Ἀσωπίαν, ἀπὸ δὲ Κορίνθου τὴν Ἐφυραίαν μετονομασθῆναι.
The land of Corinth was originally part of the Argive territory, and took its name from Corinth. That Corinth was a son of Zeus, I know of no one who has seriously asserted, except indeed the generality of the Corinthians themselves. Eumelus, however, the son of Amphilytus, one of the family called the Bacchiadae, who is said also to have composed epic poems, says in his Corinthian History (if indeed this work truly belongs to Eumelus), that Ephyra, daughter of Ocean, was first to dwell in this land, and that afterward Marathon, son of Epopeus, son of Aloeus, son of Helios, fleeing from his father’s lawlessness and insolence, migrated to the sea-coast of Attica; that upon the death of Epopeus he returned to the Peloponnese, divided the kingdom among his sons, and then again withdrew back to Attica. It was from his son Sicyon that the land called Asopia took its name; and from his son Corinth, the region previously known as Ephyraea was renamed.