A city state is a usually small independent country composed of a city whose government exercises full sovereignty or control over itself and all territories within its territory. Unlike traditional multi-jurisdictional countries, national governments share political power with regional governments, and a single city-state is the center of political, economic, and cultural life. Historically, the first recognized city-state evolved during the classical period of Greek civilization in the 4th and 5th centuries BC. The term “city-state” of the Greek city-state comes from the Acropolis of Athens (448 BC), which is the government center of ancient Athens. The popularity and prevalence of this city-state has flourished until the fall of Rome in 476, causing the government to be almost destroyed. The city nation saw a small renaissance in the 11th century, when several Italian examples, such as Naples and Venice, achieved considerable economic prosperity.