Add a new dynastic rule to the ruleset. Call it “Royalty” and give it the following text:

One City contains the Heir to the Throne, or Heir for short. The City that is the location of the Heir, if known, is publicly tracked. His location can be, and initially is, unknown, in which case the fact that it is unknown is also publicly tracked.

As a daily communal action that may only be taken while the location of the Heir is unknown, a City Architect may Search for the Heir. This is an atomic action with the following steps:
* Choose a random unit of Population from those among all cities whose controller is not idle.
* Set the location of the Heir to the City holding that Population, making it known in the process.

While the Heir’s location is known, any City Architect who controls that City may achieve victory by making a blog post saying so; this action is called a Coronation.
While the Heir’s location is known, and the controller of the Heir’s location has not performed a Coronation during the current dynasty, the controller of the Heir’s location may move the Heir to another City, or make the location of the Heir unknown again.

Set the location of the Heir to be unknown.