From Wikipedia

Ancient Civilizations - The Return of the King

Alexander's settlement of Greek colonists and culture in the east resulted in a new Hellenistic culture, aspects of which were still evident in the traditions of the Byzantine Empire until the mid-15th century. Alexander became legendary as a classical hero in the mold of Achilles, and features prominently in the history and myth of Greek and non-Greek cultures. He became the measure against which generals, even to this day, compare themselves and military academies throughout the world still teach his tactical exploits.