Alexander the Great (356-323 BCE) was a king of Macedonia who conquered an empire that stretched from the Balkans to modern-day Pakistan. Born in Pella, he was tutored by Aristotle and became king at the age of 20 after his father's assassination. Known for his military genius, he created one of history's largest empires by the age of 30. His conquests spread Greek culture and influence, marking the beginning of the Hellenistic Age. Alexander died in Babylon at the age of 32 under mysterious circumstances.