4th century BC

(5th century BC - 4th century BC - 3rd century BC - other centuries)

(2nd millennium BC - 1st millennium BC - 1st millennium AD)

• Invasion of the Celts into Ireland
• Kingdom of Macedon conquers Persian empire
• Romans build first aqueduct
• Chinese use bellows

• Plato, philosopher
• Aristotle, philosopher and scientist
• Philip II of Macedon
• Alexander the Great, King of Macedon, invades Asia Minor, Persia and reaches India

• Oldest Brahmi script dates from this period (Brahmi is the ancestor of Indic scripts)

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