He then turned his focus for the next five years to the renewal of the Lateran Treaty on its fiftieth anniversary, and his diplomatic skills allowed him to sign a revised treaty that reflected the rapid secularisation of Italy since the 1960s.
Treaty of Versailles | Treaty of Trianon | Treaty of Utrecht | Treaty of Aix-la-Chapelle | Treaty of Berlin (1878) | Treaty of Rome | Treaty of Lisbon | Treaty of Campo Formio | Treaty of Berlin | Treaty of Aix-la-Chapelle (1748) | Maastricht Treaty | Treaty of the Pyrenees | Treaty of Saint-Germain-en-Laye (1919) | Treaty of Guadalupe Hidalgo | Penn Treaty Park | Lateran Treaty | Washington Naval Treaty | Treaty of San Stefano | Treaty of Roskilde | Treaty of Nice | Treaty of Frankfurt | Treaty of Brest-Litovsk | Treaty of Bassein | Treaty of Basel | Pontifical Lateran University | Patent Cooperation Treaty | Treaty of Waitangi | Treaty of Schönbrunn | Treaty of Ryswick | Treaty of Punakha |
The most famous Lateran buildings are the Lateran Palace, once called the Palace of the Popes, and the Basilica of St. John Lateran, the cathedral of Rome, which although part of Italy is a property of the Holy See that has extraterritorial privileges as a result of the 1929 Lateran Treaty.
Thus, as a result of the 1929 Lateran Treaty which established a Concordat between the Holy See and the nation of Italy, the secular power of the Bishop of Rome, i.e., the Pope, was reduced to the one square mile of Vatican City, the smallest sovereign nation on earth.
According to the Lateran Treaty, certain properties of the Holy See that are located in Italian territory, most notably Castel Gandolfo and the major basilicas, enjoy extraterritorial status similar to that of foreign embassies.