Alexander the Great did not have this title during his life. Roman historians such as Quintus Curtius Rufus began to refer to him as "Great" in the first century AD.
Alexander's name was Alexander III of Macedon, and he was a member of the Argead dynasty. His father, Philip II, was the king of the ancient kingdom of Macedon, and Alexander succeeded to his throne at the age of 20. During his short reign of 13 years, Alexander managed to create one of the largest empires of the ancient world, which stretched from Greece to India. Because he was never defeated in battle, Alexander is still considered one of the most successful military leaders in history.