Passage 3.2.1
Εὐρυσθένει πρεσβυτέρῳ τῶν Ἀριστοδήμου παίδων ὄντι ἡλικίαν γενέσθαι λέγουσιν υἱὸν Ἆγιν· ἀπὸ τούτου δὲ τὸ γένος τὸ Εὐρυσθένους καλοῦσιν Ἀγιάδας. ἐπὶ τούτου Πατρεῖ τῷ Πρευγένους κτίζοντι ἐν Ἀχαΐᾳ πόλιν, ἥντινα Πάτρας καὶ ἐς ἡμᾶς καλοῦσιν ἀπὸ τοῦ Πατρέως τούτου, συνεπελάβοντο Λακεδαιμόνιοι τοῦ οἰκισμοῦ. συνήραντο δὲ καὶ Γρᾷ τῷ Ἐχέλα τοῦ Πενθίλου τοῦ Ὀρέστου στελλομένῳ ναυσὶν ἐς ἀποικίαν. καὶ ὁ μὲν τὴν τῆς Ἰωνίας μεταξὺ καὶ Μυσῶν, καλουμένην δὲ Αἰολίδα ἐφʼ ἡμῶν, καθέξειν ἔμελλεν· ὁ δέ οἱ πρόγονος Πενθίλος Λέσβον τὴν ὑπὲρ τῆς ἠπείρου ταύτης νῆσον εἷλεν ἔτι πρότερον.
They say that Agis, son of Eurysthenes, the elder of the sons of Aristodemus, reached maturity; and from this man, the house of Eurysthenes is called the Agiadae. In his reign, when Patreus, the son of Preugenes, was founding a city in Achaia—a city still called Patrae after this Patreus—the Lacedaemonians assisted him in this settlement. They also helped Gras, the son of Echelas, son of Penthilus, son of Orestes, who was sailing out with ships for colonization. Gras was destined to occupy the region between Ionia and Mysia, known in our day as Aeolis. Penthilus, his ancestor, had already seized Lesbos, an island opposite this mainland.