Alexander III of Macedon, known as Alexander the Great (356-323 BCE), was a king of the ancient Greek kingdom of Macedon and a pupil of Aristotle. Renowned for his unparalleled military genius, he created one of the largest empires in history by his early thirties, stretching from Greece to northwestern India. His legacy includes the spread of Greek culture and language throughout his empire, significantly influencing the subsequent Hellenistic civilization.