When conquerors want to subdue a foe, they crush their armies. If they want to rule a conquered land, however, they must displace the culture of that land. Alexander the Great knew this, and as he wanted an empire that would outlive him, he needed to displace conquered cultures with his own. This was especially urgent to him due to the diversity of his empire, including Assyrians, Jews, Egyptians, Persians, Parthians, Armenians, and a host of others. Hellenism is Greek culture, and is the primary weapon, even more than his armies, that Alexander used to influence Middle Eastern and European history for millennia.