 Where, in accordance with the decision of the 1815 Congress of Vienna, the Nuncio was not only a member of the Diplomatic Corps but its dean, this arrangement continued to be accepted by the other ambassadors.In the course of the 59 years during which the Holy See held no territorial sovereignty, the number of states that had diplomatic relations with it, which had been reduced to 16, actually increased to 29.The State of the Vatican City was created by the Lateran Treaty in 1929 to "ensure the absolute and visible independence of the Holy See" and "to guarantee to it indisputable sovereignty in international affairs."