The Greeks of the classical period believed that, in the dark age that followed the collapse of the Mycenaean civilization, significant numbers of Greeks fled and had emigrated to Asia Minor and settled there. Modern historians generally accept this migration as historic (but separate from the later colonization of the Mediterranean by the Greeks). There are, however, those who believe the Ionian migration cannot be explained as simply as the classical Greeks claimed. These settlers were from three tribal groups: the Aeolians, Dorians and Ionians. The Ionians had settled about the coasts of Lydia and Caria, founding the twelve cities that made up Ionia. These cities were Miletus, Myus and Priene in Caria; Ephesus, Colophon, Lebedos, Teos, Clazomenae, Phocaea and Erythrae in Lydia; and the islands of Samos and Chios. Although the Ionian cities were independent of one another, they recognized their shared heritage and supposedly had a common temple and meeting place, the "Panionion". They thus formed a 'cultural league', to which they would admit no other cities, or even other tribal Ionians.