Every City has a city radius, an area around the city in which its citizens work. The radius is shown on the City Display and potential radii are shown whenever a settler is active.
A square is part of a city's radius if it is
- within the city's cultural borders, and
- within two squares of the city.
The capital city of a civilization is decided by the location of its palace and usually the first city built by the empire. This is a special city that determines the commerce and production lost to corruption and waste (respectively) in every other city in the empire. Since patch 1.21 in vanilla and in Conquests, the capital will at minimum always produce 4 commerce in the city center (this is affected by the despotism penalty).
|City level||Population size||Defense Bonus||City tile resource bonus to Commerce/Shields/Food||Requirements to growth beyond|
|Town||1 to 6||+0%||none (automatic road, minimum 1 shield)||Aqueduct or fresh water (river/lake) source adjacent to city tile|
|City||7 to 12||+50%||+1 commerce, +1 shield*||Hospital or Shakespeare's Theater|
|Metropolis||13 and over||+100%||+2 commerce,+2 shields||none|
* note that due to minimum 1 shield mentioned, this does not confer a bonus for terrain types that inherently produce no shields (Grasslands, Flood plains), but will do so for others (Grasslands with Shield, Plains, Hills.)
Citizens of the city work the squares in the city radius, extracting Food, Shields, and Commerce -- the three basic currencies.
Rome is defended by a Pikeman.
To the left of the Pikeman is his green health bar, and beneath that are two white lines indicating that there are more units defending this city.
The City Screen is where the management of a city takes place.
The Big fat cross is highlighted.
The City View button gives an artistic representation of the city.