Control over territory in the game is represented by capturing and holding a major city in that territory. New cities are conquered by either training soldiers in cities that are already owned and then using those soldiers to besiege enemy cities or by bribing the city into switching sides. Apart from simply expanding one's faction, cities can have positive or negative effects on a nation. For example, well-managed cities can provide the faction that owns them with valuable tax income, but poorly-managed cities may cost the player more money in maintenance than they make in taxes. Cities have a variety of buildings that may be built or upgraded, such as temples, aqueducts, and amphitheatres. Buildings have different effects on the city; for example, aqueducts improve public health and decrease urban squalor, which in turn makes the inhabitants of the city happier. If cities grow too unhappy, they may revolt and either return to a faction that previously owned them or become a part of a generic "rebel" faction.