A ruler of Greece in the fourth century b.c. As a general, he conquered most of the ancient world, extending the civilization of Greece east to India. Alexander is said to have wept because there were no worlds left to conquer. In Alexander's youth, the philosopher Aristotle was his tutor.
Note: Before beginning his conquests, Alexander allegedly unloosed the Gordian knot by cutting through it. It was believed that the person who unfastened the Gordian knot would rule a vast territory in Asia. Alexander founded the city of Alexandria, which became a great center of learning in Egypt.