Passage 2.15.4
ἀνελθοῦσι δὲ ἐς τὸν Τρητὸν καὶ αὖθις τὴν ἐς Ἄργος ἰοῦσίν ἐστι Μυκηνῶν ἐρείπια ἐν ἀριστερᾷ. καὶ ὅτι μὲν Περσεὺς ἐγένετο Μυκηνῶν οἰκιστής, ἴσασιν Ἕλληνες· ἐγὼ δὲ αἰτίαν τε γράψω τοῦ οἰκισμοῦ καὶ διʼ ἥντινα πρόφασιν Ἀργεῖοι Μυκηναίους ὕστερον ἀνέστησαν. ἐν γὰρ τῇ νῦν Ἀργολίδι ὀνομαζομένῃ τὰ μὲν ἔτι παλαιότερα οὐ μνημονεύουσιν, Ἴναχον δὲ βασιλεύοντα τόν τε ποταμὸν ἀφʼ αὑτοῦ λέγουσιν ὀνομάσαι καὶ θῦσαι τῇ Ἥρᾳ.
As you ascend to Tretus and again return towards Argos, you find on the left the ruins of Mycenae. The Greeks well know that Perseus was the founder of Mycenae; however, I shall write down both the reason why the city was founded and the particular cause on account of which the Argives later expelled the Mycenaeans. In the area now called the Argolid they have no memory of the oldest events, but of the time when Inachus was king they say that he gave his name to the river and was the first to make sacrifice to Hera.