I think Alexander the Great should be known as so for many reasons. One reason being that he served as king of Macedonia from 336 to 323 B.C. During his time of leadership, he united Greece, reestablished the Corinthian League and conquered the Persian Empire.
It led to division of labor
Direct democracy would be extremely costly because people would have to vote on every single thing and this would cost time and money to ensure everyone has voted. It couldn't be resolved in early times, but maybe with the age of technology, you could surpass that by having everyone vote online or something similar.
