1) Alexander the Great conquered most of the known world by the age of 33 after being tutored by Aristotle and taking advantage of the weakened Greek city-states.
2) He defeated Darius III and the Persian Empire in a series of decisive battles between 334-331 BC, capturing the Persian capital of Persepolis.
3) Though his troops grew weary after 11 years of warfare, Alexander had created the largest empire in the ancient world before his death in 323 BC, spreading Greek culture and a common language across three continents.