Prisoner in the Vatican the Basilica of St. John Lateran, situated on the opposite side of the city of Rome, and to travel regularly to their summer residence at Castel Gandolfo, from Rome. Prisoner in the Vatican A prisoner in the Vatican or prisoner of the Vatican (; ) is how Pope Pius IX was described following the capture of Rome by the armed forces of the Kingdom of Italy on 20 September 1870. Part of the process of Italian unification, the city's capture ended the millennial temporal rule of the popes over central Italy and allowed Rome to be designated the capital of
Prisoner in the Vatican or from inside the basilica, and papal coronations were instead held at the Sistine Chapel. The period ended in 1929, when the Lateran Treaty created the modern state of Vatican City. The 13 May 1871 Italian Law of Guarantees, passed eight months after the capture of Rome, was an attempt to solve the problem by making the pope a subject of the Kingdom of Italy, not an independent sovereign, while guaranteeing him certain honors similar to those given to the king and the right to send and receive ambassadors. The popes—Pius IX (died 1878) and his successors Leo XIII (reigned