What Was The First Megalopolis?

What Was The First Megalopolis? Did you know? A “large city” named Megalopolis was founded in Greece in 371 B.C. to help defend the region called Arcadia against the city-state of Sparta. Though a stadium seating 20,000 was built there, indicating the city’s impressive size for its time, Megalopolis today has only about 5,000 people.