Papal States Timeline

Pope Innocent III presided over the height of medieval papal power, claiming suzerainty over the Kingdom of Sicily and extending Papal States influence across central Italy. He intervened in imperial elections and launched crusades, making the pope a dominant force in European politics.

Image source: Pope Innocent III

Cardinal Gil Álvarez de Albornoz led military campaigns that restored papal authority over most of the Papal States, defeating local tyrants such as the Malatesta family. His legation re-established effective governance and drafted the Aegidian Constitutions, which governed the states until 1816.

Image source: Gil Álvarez Carrillo de Albornoz

Pope Sixtus IV aggressively enlarged the Papal States, acquiring Imola and Forlì and installing nephews as rulers. His policies provoked the Pazzi Conspiracy against the Medici and wars with Florence and Naples, exemplifying the entanglement of papal spiritual and temporal ambitions.

Image source: Pope Sixtus IV

Pope Alexander VI dispatched his son Cesare Borgia to conquer the Romagna, subduing semi-independent lordships like Imola, Forlì, Rimini, and Urbino. These conquests were incorporated into the Papal States, though Cesare's power collapsed after his father's death in 1503.

Image source: Cesare Borgia

The 'Warrior Pope' personally led campaigns to recover Perugia and Bologna for the Papal States. Julius II also formed the League of Cambrai against Venice and later the Holy League against France, using diplomacy and war to maximize papal territorial holdings.

Image source: Pope Julius II

Pope Gregory XIII issued the bull Inter gravissimas, replacing the Julian calendar with the Gregorian calendar. As ruler of the Papal States, he also strengthened their administration, founding colleges and seminaries and supporting Jesuit missions worldwide.

Image source: Gregorian calendar

Sixtus V transformed Rome with grand urban planning, erecting obelisks, building aqueducts, and completing St. Peter's dome. He reorganized the Roman Curia into congregations and drained the Pontine Marshes, leaving the Papal States more prosperous and efficiently governed.

Image source: Pope Sixtus V

Queen Christina's spectacular public abjuration of Lutheranism and entry into Rome was celebrated by Pope Alexander VII. Her residence in the city enhanced Rome's prestige as the Catholic world's capital and boosted the cultural life of the Papal States.

Image source: Christina, Queen of Sweden

Benedict XIV was renowned as one of the most enlightened pontiffs, encouraging agriculture, industry, and scholarship in the Papal States. He reformed taxation, supported scientific academies, and improved relations with Catholic monarchs while tempering the Inquisition's harshness.

Image source: Pope Benedict XIV

Under intense pressure from Bourbon monarchs, Pope Clement XIV dissolved the Jesuit order. The suppression weakened the educational and missionary network that had sustained papal influence, reflecting the declining ability of the Papal States to resist secular powers.

Image source: Suppression of the Society of Jesus

Napoleon Bonaparte's Italian campaign forced Pope Pius VI to sign the Treaty of Tolentino in February 1797, ceding Avignon, Bologna, Ferrara, and the Romagna to France and paying heavy indemnities. This marked the beginning of the end for the old Papal States.

Image source: Papal States

French forces expelled Pope Pius VI from Rome and proclaimed a Roman Republic modeled on revolutionary principles. The aged pope was carried off into captivity in France, where he died in Valence in August 1799, leaving the Papal States abolished for the first time.

Image source: Roman Republic (1798–1799)

After Napoleon's rise, Pius VII returned to Rome and gradually regained much of the Papal States. However, disputes with Napoleon led to the French annexation of Rome in 1809 and the pope's imprisonment at Savona and Fontainebleau until Napoleon's fall in 1814.

Image source: Pope Pius VII

The Congress of Vienna fully restored the Papal States, returning the Legations and other territories lost to Napoleon. Under Austrian protection, the restored states were administered conservatively, resisting liberal and nationalist currents spreading across Italy.

Image source: Congress of Vienna

Revolutionary unrest culminated in the assassination of minister Pellegrino Rossi and the flight of Pope Pius IX to Gaeta. Revolutionaries proclaimed a Roman Republic in February 1849, abolishing papal temporal power until French troops crushed the republic and restored the pope in 1850.

Image source: Roman Republic (1849–1850)

During the Second Italian War of Independence and Garibaldi's Expedition of the Thousand, Piedmont-Sardinia seized the Legations, Umbria, and the Marches after defeating papal forces at Castelfidardo. Only Rome and its surrounding Latium remained to the pope, garrisoned by French troops.

Image source: Capture of Rome

Meeting in St. Peter's Basilica, the council defined the dogma of papal infallibility even as Italian unification loomed. The outbreak of the Franco-Prussian War forced the suspension of the council and the withdrawal of French troops protecting Rome.

Image source: First Vatican Council

Italian Bersaglieri breached the Porta Pia and entered Rome, ending over eleven centuries of papal temporal rule. A plebiscite ratified union with the Kingdom of Italy, and Rome became the national capital, reducing the pope to a self-declared 'prisoner in the Vatican.'

Mussolini's government and Pope Pius XI signed the Lateran Pacts, creating the tiny Vatican City State as successor to the Papal States' temporal sovereignty. The treaty compensated the Holy See financially and settled the 'Roman Question' that had persisted since 1870.

Image source: Lateran Treaty