The Holy See is the universal government of the Catholic Church, headed by the Pope and administered through the Roman Curia. It is a sovereign subject of international law distinct from Vatican City State, the small territory in Rome established by the Lateran Treaty of 1929 between the Holy See and Italy. While Vatican City provides the territorial base, it is the Holy See — not the city-state — that conducts diplomacy, signs treaties, and exchanges ambassadors.
Holy See diplomacy is carried out by the Secretariat of State, headed by the Cardinal Secretary of State, and through a global network of apostolic nunciatures. A papal ambassador is called a nuncio; in many Catholic-majority countries the nuncio traditionally serves as dean of the diplomatic corps under the 1961 Vienna Convention on Diplomatic Relations. The Holy See maintains bilateral relations with the large majority of UN member states and holds Permanent Observer status at the United Nations, granted in 1964 and upgraded in 2004 to allow expanded participation rights short of voting.
Characteristic features include:
- A focus on soft power: moral suasion, mediation, and humanitarian advocacy rather than economic or military leverage.
- Long-running engagement on peace, disarmament, refugees, religious freedom, and bioethical issues.
- Use of concordats — bilateral treaties regulating the Church's legal status within a state.
- Discreet mediation, such as the Holy See's role in the 1978–1984 Beagle Channel dispute between Argentina and Chile, and its facilitation of the 2014 announcement of US–Cuba rapprochement under Pope Francis.
The Holy See is also a party to multilateral instruments including the Geneva Conventions, the Nuclear Non-Proliferation Treaty, and the Treaty on the Prohibition of Nuclear Weapons. Its diplomatic posture is shaped by Catholic social teaching, which influences its positions on conflict, migration, climate, and development — sometimes aligning with the Global South and sometimes with socially conservative blocs.
Example
In December 2014, Pope Francis was publicly credited by Presidents Obama and Raúl Castro with helping broker the diplomatic thaw between the United States and Cuba.
Frequently asked questions
No. Vatican City is a sovereign territory created in 1929; the Holy See is the ecclesiastical government of the Catholic Church and is the entity that conducts diplomacy and signs treaties.
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