Answer: The smallest State in the world, the Vatican City State, was born of the Lateran Accords, signed on February 11, 1929, by Cardinal Pietro Gasparri, Secretary of State, and by Prime Minister Benito Mussolini on behalf of Pius XI (1922-1939) and King Victor-Emmanuel III respectively.

The 1929 Accords created a sovereign entity on 109 acres, which makes the central government of the Catholic Church, the Holy See, a subject of international public law. They also allow for its independence from any established authority in the world. The Pope resides in Vatican City, where some organizations of the Holy See are headquartered. Head of State of the Vatican, he delegates his duties of representing the Vatican in international relations, for diplomatic relations and for the conclusion of treaties, to the Secretariat of State of the Holy See.

The Vatican post office issued postcards to commemorate the 85th anniversary of the Vatican State in 2014.

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85TH ANNIVERSARY OF THE VATICAN STATE POSTCARDS
(Depicts the Popes who have reigned since the foundation of the Vatican State to 2014)
Laudible work painted by Daniela Longo.

85th Anniversary of the Vatican State
Pope Pius XI
Pope Pius XII
Pope John XXIII
Pope Paul VI

Pope John Paul I
Pope John Paul II
Pope Benedict XVI
Pope Francis
P198-P201 (2014)