Ancient demographics are available only from literary sources. Herodotus states that in Asia the Ionians kept the division into twelve cities that had prevailed in Ionian lands of the north Peloponnese, their former homeland, which became Achaea after they left. These twelve cities (aka Ionian League) were (from south to north) Miletus, Myus, Priene, Ephesus, Colophon, Lebedos, Teos, Erythrae, Clazomenae and Phocaea, together with Samos and Chios. Smyrna, originally an Aeolic colony, was afterwards occupied by Ionians from Colophon, and became an Ionian city — an event which had taken place before the time of Herodotus.