It encompasses the Iron Age in the Old World and sees the transition from the Ancient Near East to classical antiquity.
In Greece, Classical Antiquity begins with the colonization of Magna Graecia and peaks with the conquest of the Achaemenids and the subsequent flourishing of Hellenistic civilization (4th to 2nd centuries).
Towards the close of the millennium, the Han dynasty extends Chinese power towards Central Asia, where it borders on Indo-Greek and Iranian states.
Early literature develops in Greek, Latin, Hebrew, Sanskrit, Tamil and Chinese.
The term Axial Age, coined by Karl Jaspers, is intended to express the crucial importance of the period of c. the 8th to 2nd centuries BC in world history.
Close to 90% of world population at the end of the first millennium BC lived in the Iron Age civilizations of the Old World (Roman Empire, Parthian Empire, Graeco-Indo-Scythian and Hindu kingdoms, Han China).