Vatican City
Citizenship

Unlike citizenship of other states, which is based either on jus sanguinis (birth from a citizen, even outside the state's territory) or on jus soli (birth within the territory of the state), citizenship of Vatican City is granted on jus officii, namely on the grounds of appointment to work in a certain capacity in the service of the Holy See. It usually ceases upon cessation of the appointment. Citizenship is also extended to the spouse and children of a citizen, provided they are living together in the city. Some individuals are also authorized to reside in the city but do not qualify or choose not to request citizenship. Anyone who loses Vatican citizenship and does not possess other citizenship automatically becomes an Italian citizen as provided in the Lateran Treaty.

The Holy See, not being a country, issues only diplomatic and service passports, whereas Vatican City issues normal passports for its citizens.
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