First Citizen

First Citizen is the title held by the governors of Vault City, after they've left the Vault 8 and abandoned the title of Overseers. It is unclear what their prerogatives are, but they are head of the state, deal with Vault City's foreign policies, and revoke citizenships with gusto. They do have term limits.

List of First Citizenz

 * At the time of Fallout 2, Joanne Lynette is the First Citizen of Vault City.
 * After the destruction of the Enclave, Senior Council Member McClure was appointed First Citizen

Appearances
First Citizen appears only in Fallout 2.

Behind the Scenes
This is possibly a reference to Issac Asimov's "Foundation Trilogy" in which the character known as "The Mule" makes himself the first citizen of the planet Klagan which he captured earlier