During the first millennium B.C. the Thracian tribes were a relatively unified tribal entity. Their history can be classified in two main periods: the first one dates from the end of the second millennium B.C. until the end of the 6th century B.C. During this period, and particularly after the eighth century B.C., Greek colonizers began to settle along the Aegean and Black Sea littoral. Quite a number of Greek city-colonies had Thracian names, including Byzantion- later the famous capital of Byzantium (Greek settlers from the town of Megara formed this colony, naming it after Byzas the Thracian). The second period, from the end of the 6th century until the turn of the 3rd century B.C. was the Golden Age of the Thracian state and culture.