Passage 7.18.5
Ἀχαιῶν δὲ ὕστερον ἐκβαλόντων Ἴωνας, Πατρεὺς ὁ Πρευγένους τοῦ Ἀγήνορος ἐς μὲν Ἄνθειαν καὶ ἐς Μεσάτιν μὴ ἐνοικίζεσθαι τοῖς Ἀχαιοῖς ἀπεῖπε, περίβολον δὲ τείχους πρὸς τῇ Ἀρόῃ βαλόμενος μείζονα, ἵνα ἐντός οἱ τοῦ περιβόλου καὶ ἡ Ἀρόη γένηται, ὄνομα ἔθετο ἀφʼ ἑαυτοῦ Πάτρας τῇ πόλει. Ἀγήνωρ δὲ ὁ πατὴρ τοῦ Πρευγένους Ἀρέως παῖς ἦν τοῦ Ἄμπυκος, ὁ δὲ Ἄμπυξ Πελίου τοῦ Αἰγινήτου τοῦ Δηρείτου τοῦ Ἁρπάλου τοῦ Ἀμύκλα τοῦ Λακεδαίμονος.
Later, when the Achaeans expelled the Ionians, Patreus, the son of Preugenes, son of Agenor, forbade the Achaeans to settle in Antheia and Mesatis. Instead, he enclosed a larger area with a wall around Aroe, ensuring that Aroe too would stand within the enclosure, and he named the city Patras after himself. Agenor, the father of Preugenes, was the son of Areus, who was the son of Ampyx, Ampyx being the son of Pelias, who was son of Aeginetes, son of Dereites, son of Harpalus, son of Amyclas, son of Lacedaemon.