Colonies in antiquity were post-Iron Age city-states founded from a mother-city or metropolis rather than a territory-at-large. Bonds between a colony and its metropolis often remained close, and took specific forms during the period of classical antiquity. Generally, colonies founded by the ancient Phoenicians, Carthage, Rome, Alexander the Great and his successors remained tied to their metropolis, though Greek colonies of the Archaic and Classical eras were sovereign and self-governing from their inception. While Greek colonies were often founded to solve social unrest in the mother-city by expelling a part of the population, Hellenistic, Roman, Carthaginian, and Han Chinese colonies were used for trade, expansion and empire-building.

Phocaea or Phokaia was an ancient Ionian Greek city on the western coast of Anatolia. Greek colonists from Phocaea founded the colony of Massalia in 600 BC, Emporion in 575 BC and Elea in 540 BC.