The Capital in Sid Meier's Civilization is the primary city of your civilization's empire, characterized by the existence of its Palace. If a civilization's capital falls, that civilzation may go into civil war
Capital functions
The first city that your starting Settlers unit has constructed becomes your Capital (with a free Palace), until you decide to build a new Palace in another city, which causes that city to replace your existing Capital, and your Palace to be moved to that city.
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