ON THIS DATE in 338 BC, eighteen-year-old Alexander the Great, led the left wing of the Macedonian army to victory over Thebes at the Battle of Chaeronea. His father, King Philip II, led the right wing.
Historians credit Alexander with breaking through the Theban line and winning the battle, which united Greek city-states under Macedonian rule.
Two years later, one of his bodyguards murdered Philip, making the twenty-year-old Alexander king of Macedonia. Alexander the Great would conquer Persia, Egypt, and more before his death, possibly from typhoid fever, at age thirty-two.