And he was an important military model for many generals throughout history. But his main post-death legacy may be that he introduced the Persian idea of absolute monarchy to the Greco-Roman world, which would become a pretty big deal. Alexander also built a number of cities on his route that became big deals after his death, and it's easy to spot them because he named most of them after himself and one after his horse. The Alexandrian Egypt became a major center of learning in the classical world and was home to the most amazing library ever, which Julius Caesar probably accidentally burned down while trying to conquer a bunch of land to emulate his hero, Alexander the Great. Plus, the dead Alexander had a huge impact on culture. He gave the region its common language, Greek, which facilitated conversations and commerce. Greek was so widespread that archaeologists have found coins in what is now Afghanistan with pictures of their kings with the word king written beneath the pictures in Greek.