Passage 7.3.9
ἀπελθόντες δὲ ἑκουσίως καὶ ἐκ τῆς Κολοφωνίας, οὕτω γῆν τε ἔσχον, ἣν καὶ νῦν ἔτι ἔχουσι, καὶ κατεσκευάσαντο ἐν τῇ ἠπείρῳ Κλαζομενὰς πόλιν· ἐς δὲ τὴν νῆσον διέβησαν δὴ κατὰ τὸ Περσῶν δέος. Ἀλέξανδρος δὲ ἀνὰ χρόνον ἔμελλεν ὁ Φιλίππου χερρόνησον Κλαζομενὰς ἐργάσεσθαι χώματι ἐς τὴν νῆσον ἐκ τῆς ἠπείρου. τούτων τῶν Κλαζομενίων τὸ πολὺ οὐκ Ἴωνες, Κλεωναῖοι δὲ ἦσαν καὶ ἐκ Φλιοῦντος, ὅσοι Δωριέων ἐς Πελοπόννησον κατελθόντων ἐξέλιπον τὰς πόλεις·
Having departed voluntarily also from the territory of Colophon, they thus obtained the land which they still possess today, and founded on the mainland the city of Clazomenae. Later, due to fear of the Persians, they crossed over onto the island. In a later time, Alexander, son of Philip, was destined to turn Clazomenae into a peninsula by constructing a causeway from the mainland to the island. Most of these Clazomenians were not Ionians but Cleonaeans and settlers from Phlius—those who departed from their cities at the time when the Dorians invaded the Peloponnesus.