Passage 7.1.6
τὰ δὲ ἐς Ἴωνας καὶ Ἀχαιούς, ὁπόσα ἐπράχθη σφίσιν ἐπʼ ἀλλήλους, ἐπέξεισιν αὐτίκα ὁ λόγος μοι προδιηγησαμένῳ καθʼ ἥντινα αἰτίαν τοῖς Λακεδαίμονα οἰκοῦσι καὶ Ἄργος πρὸ τῆς τῶν Δωριέων καθόδου μόνοις Πελοποννησίων ὑπῆρξεν Ἀχαιοῖς καλεῖσθαι. Ἄρχανδρος Ἀχαιοῦ καὶ Ἀρχιτέλης ἐς Ἄργος ἀφίκοντο ἐκ τῆς Φθιώτιδος, ἐλθόντες δὲ ἐγένοντο Δαναοῦ γαμβροί, καὶ Αὐτομάτην μὲν Ἀρχιτέλης, Σκαιὰν δὲ ἔλαβεν Ἄρχανδρος. δηλοῦσι δὲ ἐν Ἄργει καταμείναντες οὐχ ἥκιστα ἐν τῷδε· Μετανάστην γὰρ τῷ παιδὶ ὄνομα ἔθετο Ἄρχανδρος.
Concerning the Ionians and the Achaeans, whatever actions these peoples undertook against each other, my narrative will promptly set forth after I have first explained for what reason only those who dwelt in Lacedaemon and Argos among all the peoples of the Peloponnese were called Achaeans prior to the Dorian invasion. Archander and Architeles, sons of Achaeus, came to Argos from Phthiotis; once arrived, they became sons-in-law of Danaus, Architeles marrying Automate and Archander taking Scaea as his wife. That they settled permanently in Argos is shown most clearly by the following evidence: Archander gave his son the name Metanastes ("immigrant").