After the period that followed the arrival of the Dorians, known as the Greek Dark Ages or the Geometric Period, the classical Greek culture developed in the southern Balkan peninsula, the Aegean islands and the western Asia Minor Greek colonies starting around the 9th or 8th century BC and peaking with the democracy that developed in 6th and 5th century BC Athens. Later, Hellenistic culture spread throughout the empire created by Alexander the Great in the 4th century BC. The Greeks were the first to establish a system of trade routes in the Balkans, and in order to facilitate trade with the natives, between 700 BC and 300 BC they founded a number of colonies on the Black Sea (Pontus Euxinus) coast, Asia Minor, Dalmatia, Southern Italy (Magna Graecia) etc.