Passage 3.1.8
λαβόντες λογισμὸν ὅτι Θήρᾳ μὲν ἐς αὐτὸν ἀνῄει Κάδμον τὸ γένος, οἱ δὲ ἦσαν ἀπόγονοι Μεμβλιάρου· Μεμβλίαρον δὲ ἄνδρα ὄντα τοῦ δήμου Κάδμος ἐν τῇ νήσῳ κατέλιπεν ἡγεμόνα εἶναι τῶν ἐποίκων. καὶ Θήρας μὲν τῇ τε νήσῳ μετέβαλεν ἀφʼ ἑαυτοῦ τὸ ὄνομα καί οἱ καὶ νῦν ἔτι οἱ Θηραῖοι κατὰ ἔτος ἐναγίζουσιν ὡς οἰκιστῇ· Προκλεῖ δὲ καὶ Εὐρυσθένει μέχρι μὲν τῆς προθυμίας τῆς ἐς τὸν Θήραν ἐς τὸ αὐτὸ συνῆλθον αἱ γνῶμαι, τὰ δὲ λοιπὰ διειστήκει σφίσιν ἐπὶ παντὶ τὰ βουλεύματα.
Taking into consideration that on Therās himself the family line went back to Cadmus, while they themselves were descendants of Membliarus; and Membliarus was a townsman whom Cadmus had appointed leader of the settlers he left behind on the island. Therās changed the name of the island, naming it after himself, and even now the Therans, every year, offer sacrifices to him as their founder. Procles and Eurysthenes agreed with Therās only insofar as their enthusiasm toward him went, but concerning all other matters their opinions were completely at variance.