Alexander the Great Alexander the Great was king of the Macedonians and one of the greatest generals in history. As a student of the Greek philosopher Aristotle, Alexander was embedded with lasting interests in philosophy, politics and warfare. As king, he settled problems by immediate action, making quick decisions and taking great risks. His armies overcame these risks by sheer force and by the ingenious tactics instilled in them by Alexander. He and his armies conquered the Persian Empire, which stretched from the Mediterranean Sea to India and formed much of what was then considered the civilized world. Through his conquests,