When a player places a tile that scores points for another player but not for him or herself that turn, the player may place a follower in one of the four areas of the City. Later, when a player scores a feature, any player may move a meeple from the appropriate area of the City to that feature and score that feature himself if he has the most followers. If a player has a meeple on the Castle, he may move it to a city; from a Cathedral to a Monastery; from a Blacksmith to a Road and from a Market to a Farm.
The Count can be found on one of the four areas of the City. At the beginning of the game, it is placed on the Castle. When the count is in an area of the city, no follower can be moved from that area. If a new follower is placed in the City, that player may move the Count to another area of the City.
 - BoardGameGeek page on the Count of Carcassonne mini-expansion