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Capture of Rome

1870 completion of Italian unification

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The capture of Rome by the Royal Italian Army brought an end to the Papal States, which had existed since the Donation of Pepin in 756, along with the temporal power of the Holy See, and led to the establishment of Rome as the capital of unified Italy. It is widely commemorated in Italy, especially in cathedral cities, by naming streets for the date: Via XX Settembre (spoken form: "Via Venti Settembre").

Background

In 1859, during the Second Italian War of Independence, much of the Papal States had been conquered by the Kingdom of Sardinia under Victor Emmanuel II. The next year, Giuseppe Garibaldi's Expedition of the Thousand resulted in the annexation of the Kingdom of the Two Sicilies by Sardinia, leading to the proclamation of the Kingdom of Italy on 17 March 1861. The new state had not yet incorporated Rome and the surrounding region of Lazio, which remained part of the Papal States, and Veneto, which was ruled by Austria as a crown land and would only be annexed in 1866, after the Third Italian War of Independence.

The first Prime Minister of Italy, Camillo Benso, Count of Cavour, died soon after the proclamation of Italian national unity, leaving to his successors to solve the knotty Venetian and Roman problems. Cavour had firmly believed that without Rome as the capital, Italy's unification would be incomplete. "To go to Rome", said his successor, Bettino Ricasoli, "is not merely a right; it is an inexorable necessity." In regard to the future relations between church and state, Cavour's famous dictum was, "A free Church in a free State"; by which he meant that the former should be entirely free to exercise her spiritual powers and leave politics entirely to the latter.

On 27 March 1861, the new Italian Parliament met in Turin and declared Rome the capital of Italy. However, the Italian government could not take its seat in Rome because it did not control the territory. Also, a French garrison was maintained in the city by Emperor Napoleon III in support of Pope Pius IX, who was determined not to hand over temporal power in the State of the Church.

Franco-Prussian War

On 13 and 18 July 1870, in the last months of the papacy's rule over Rome, the First Vatican Council which had begun in 1869 affirmed the doctrine of papal infallibility. Then, bishops left Rome due to opposition stance, or for a summer break. The First Vatican Council never reconvened, and was formally closed only in 1870.

Also in July 1870, France declared war on Prussia, and by early August, Napoleon III recalled his garrison from Rome. The French not only needed the troops to defend their homeland, but were concerned that Italy might use the French presence in Rome as a pretext to join the war against France. Already in 1866, after the Austro-Prussian War had begun in June, Italy took advantage and attacked Austria to gain territory, and thus allied with Prussia. With Papal Rome still guarded by French forces, Italian public opinion again favored the Prussian side at the start of the Franco-Prussian War. The removal of the French garrison allowed Italy to remain neutral and eased tensions between France and Italy.

It was only after the surrender of Napoleon III and his army at the Battle of Sedan on 2 September that the situation changed radically. The French Emperor was captured and deposed. The best French units had been captured by the Prussians, who quickly followed up their success at Sedan by marching on Paris. Faced with a pressing need to defend the capital with its remaining forces, the provisional government of the newly proclaimed French Republic was clearly not in a military position to retaliate against Italy. In any case, the republican government was far less sympathetic to the Holy See than the Empire and did not possess the political will to protect the pope's position.

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