The colonies in Macedonia and Thrace were very numerous, and extended all along the coast of the AEgean, of the Hellespont, of the Propontis, and of the Euxine, from the borders of Thessaly to the mouth of the Danube. Of these we can only glance at the most important. The colonies on the coast of Macedonia were chiefly founded by Chalcis and Eretria in Euboea; and the peninsula of Chalcidice, with its three projecting headlands, was covered with their settlements, and derived its name from the former city. The Corinthians likewise planted a few colonies on this coast, of which Potidaea, on the narrow isthmus of Pallene, most deserves mention.
Of the colonies in Thrace, the most flourishing were Selymbria and Byzantium [the city where Constantinople was later built, opening the Byzantine period of Greek history], both founded by the Megarians, who appear as an enterprising maritime people at an early period.
William Smith,
A Smaller History of Ancient Greece
