City Types
There are five different types of city. 
 
Player Cities
Barbarian Cities: These cities can't be occupied. However, you can attack them to earn task rewards and items, boost your Prestige or plunder resources. 
 
Normal NPC Cities:Normal cities are weaker than high-level cities, but they also have their own strong points. 
 
County City: Within a County City's jurisdiction, orders can be issued to other player's cities. The highest level that resource production sites can be upgraded to is 12. 
 
Large City: Within a Large City's jurisdiction, orders can be issued to other player's cities. The highest level that resource production sites can be upgraded to is 15. 
 
Provincial City: Within a Provincial City's jurisdiction, orders can be issued to other player's cities. The highest level that resource production sites can be upgraded to is 18. 
 
Capital City: Roma, the empire's greatest city, is the most powerful in the empire. The highest level that resource production sites can be upgraded to is 20.