Hellenistic Period

The Hellenistic Period denotes the roughly three centuries between the death of Alexander the Great in 323 BCE and the death of Cleopatra VII in 30 BCE, after which Egypt became a Roman province. The term was popularized by the 19th-century German historian Johann Gustav Droysen, who used Hellenismus to describe the fusion of Greek (Hellenic) civilization with the cultures of Egypt, Mesopotamia, Persia, and the Indus borderlands following Alexander's conquests.

After Alexander's death, his empire fragmented in the Wars of the Diadochi (322–281 BCE) among his generals. Three principal successor kingdoms emerged:

• The Ptolemaic Kingdom in Egypt, founded by Ptolemy I Soter, with its capital at Alexandria.
• The Seleucid Empire, founded by Seleucus I Nicator, stretching at its peak from Anatolia to the borders of India.
• The Antigonid dynasty in Macedon and mainland Greece.

Smaller polities such as the Attalid kingdom of Pergamon, the Greco-Bactrian and Indo-Greek kingdoms, and various Greek leagues (Aetolian, Achaean) also shaped the period's politics.

Hellenistic culture is associated with the spread of Koine Greek as a lingua franca, the rise of cosmopolitan cities modeled on the polis, and major intellectual institutions like the Library and Museum of Alexandria. It produced advances in mathematics (Euclid, Archimedes, Apollonius), astronomy (Aristarchus, Hipparchus), philosophy (Stoicism, Epicureanism, Skepticism), and sculpture (the Laocoön, the Venus de Milo, the Pergamon Altar).

The period closed gradually as Rome absorbed the successor states: Macedon fell after the Battle of Pydna (168 BCE), the Attalids bequeathed Pergamon to Rome in 133 BCE, the Seleucid rump was annexed by Pompey in 63 BCE, and Ptolemaic Egypt was taken by Octavian in 30 BCE after the Battle of Actium.

For IR and Model UN researchers, the Hellenistic Period is a frequent reference point for early multipolar state systems, diplomatic networks, and cultural syncretism.