Alexander and the Hellenistic world

Alexander III of Macedon, known as Alexander the Great, conquered the Persian Empire and extended his rule from the eastern Mediterranean into Central and South Asia. His campaigns transformed political relationships and helped spread Greek-speaking communities far beyond the Aegean. His empire did not remain united after his death, but its successor kingdoms shaped the Hellenistic world.

The Macedonian inheritance

Alexander’s achievements depended partly on the power built by his father, Philip II. Philip strengthened the army, exploited rivalries between Greek cities and defeated Athens and Thebes at Chaeronea in 338 BCE. Macedonian infantry used the sarissa, a long pike, in disciplined formations supported by cavalry. Success depended on coordination between different forces, not on the pike alone.

When Philip was assassinated in 336 BCE, Alexander became king at about twenty. Educated in part by Aristotle and influenced by heroic traditions associated with Achilles, he inherited both an experienced army and plans for war against Persia. He first had to secure his authority rather than simply begin an uninterrupted march of conquest.

Defeating the Persian Empire

Alexander crossed into Asia Minor in 334 BCE. Victory at the Granicus opened the campaign, and his defeat of Darius III at Issus in 333 strengthened his position. He then secured parts of the eastern Mediterranean coast and entered Egypt, where he founded Alexandria in 331. Controlling coastal areas reduced the danger to his communications and supported further operations inland.

At Gaugamela in 331 BCE, another major victory opened the way to Babylon and the Persian imperial centres. The burning of the palace complex at Persepolis in 330 became a powerful symbol of Persian defeat, although its motives should not be reduced to one unquestioned explanation. Conquest involved sieges, destruction and the displacement of people as well as celebrated battlefield victories.

The eastern campaigns and their limits

Resistance continued after the collapse of Darius’ rule. Alexander campaigned in Central Asia, including areas of present-day Afghanistan and Uzbekistan, before moving towards the Indian subcontinent. In 326 BCE, his army fought near the Hydaspes River. The soldiers eventually refused to advance further east, demonstrating that even a successful king depended on the willingness and endurance of his forces.

The return journey imposed heavy losses and logistical difficulties. Alexander reached Babylon, where he died in 323 BCE at thirty-two. The exact cause of his final illness remains uncertain. He left no adult successor able to command general acceptance, making the unity of his empire particularly fragile.

Governing different peoples

Alexander retained elements of Persian administration and worked with some local elites while installing Macedonian military authority. Garrisons and new settlements secured strategic places. He adopted aspects of Persian royal behaviour and encouraged marriages linking Macedonian and Persian elites, most famously at Susa in 324 BCE.

These policies could create cooperation but also provoke resistance among his followers and conquered populations. Cultural interaction did not remove the inequalities of conquest. Greek and Macedonian settlers lived alongside established communities, producing new connections without making every region socially or culturally identical.

The successor kingdoms and Alexandria

After Alexander’s death, competing commanders fought for control. The Ptolemies established themselves in Egypt, the Seleucids controlled large parts of Asia, and the Antigonids eventually ruled Macedon. Their kingdoms combined Greek-speaking royal courts and cities with diverse local populations. Greek became an important language of administration, commerce and scholarship across much of the eastern Mediterranean.

Alexandria in Egypt grew into a major port and centre of learning under the Ptolemies. Its Museum, Library and famous lighthouse developed after Alexander’s foundation of the city. Greek, Egyptian, Jewish and other communities contributed to its cosmopolitan character. The incorporation of Ptolemaic Egypt into the Roman Empire after Cleopatra VII’s death in 30 BCE conventionally marks the end of the Hellenistic period, although its cultural legacies continued.