Vatican timeline

4th Century AD: Old St. Peter’s Basilica built
Commissioned by Emperor Constantine over St. Peter’s tomb.

756: Papal States established
Pepin the Short donates territory, founding Vatican’s political base.

1377: Papacy returns to Rome
After the Avignon Papacy, the Pope re-establishes Rome as the seat.

1506–1626: New St. Peter’s Basilica constructed
Major Renaissance project led by Bramante, Bernini, and Michelangelo – who also painted the Sistine Chapel ceiling.

1870: Papal States annexed by Italy
Vatican loses temporal power; Pope becomes “prisoner in the Vatican.”

1929: Lateran Treaty signed
Vatican City recognized as an independent state by Italy.

1934–1958: Pius XII and WWII era
The first and the only railway station was opened. Vatican maintains neutrality; criticized for limited Holocaust response.

1962–1965: Second Vatican Council held
Major reforms in Catholic doctrine and modernization of the Church.

2005: Death of Pope John Paul II
One of the most influential popes; drew millions to the Vatican.

2013: Pope Benedict XVI resigns
First papal resignation in 600 years; Pope Francis elected.

2025: Year of Jubilee and Pope Leo
Amidst the Vatican Jubilee, Pope Francis passes; Cardinal Robert Prevost is elected.

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The Vatican's history explained

Early history

1st century BC - 41 AD

During the Roman Republic, "Vatican" referred to the Ager Vaticanus, a flood-prone area near Etruscan Veii. By the 1st century AD, it included today’s St. Peter’s Square. Between 14 BC and 33 AD, Agrippina the Elder drained the land, her son Caligula built a circus there, and Emperor Nero finished it. The area soon became a Christian martyrdom site, including for St. Peter.

Earliest church & papal states

326 - 1377 AD

Between 318–322 CE, construction began on Old St. Peter’s Basilica over Saint Peter’s believed tomb; a palace followed in the 5th century under Pope Symmachus. Popes later ruled the Papal States and lived at the Lateran and Quirinal Palaces, with a temporary move to Avignon, France, from 1309 to 1377.

Roman question

1870 - 1878

In 1870, Italy unified under King Victor Emmanuel II, triggering the 'Roman Question' over the Pope’s status (1861–1929). Italy seized church properties, including the Quirinal Palace. Popes stayed within the Vatican, refusing to recognize Italy’s rule in Rome. Pope Pius IX was called a "prisoner in the Vatican" as popes shifted focus to spiritual roles.

Lateran Treaty

1929

Negotiations to resolve the Roman Question began in 1926, leading to the Lateran Pacts, signed on 11 Feb 1929 by Mussolini for King Victor Emmanuel III and Cardinal Gasparri for Pope Pius XI. Ratified in June, the treaty established Vatican City as an independent country, thereby granting 44 hectares (109 acres) of land that would now be fully independent and governed by the pope.

World War II

1939 - 1945

During WWII, under Pope Pius XII, Vatican City remained neutral and unoccupied, even as Rome fell to German forces. Both Axis and Allied powers respected its neutrality; even stray pamphlets drew papal protest. The U.S. opposed bombing Rome and allowed Catholic airmen to opt out of raids on Rome and Church sites.

Vatican post-war

After 1945

Pius XII appointed 32 cardinals in 1946 to fill wartime vacancies. In 1970, the Pontifical Military Corps was disbanded, except the Swiss Guard; the Gendarmerie became civilian police. A 1984 concordat with Italy ended Catholicism as the state religion. In 1995, plans for Domus Sanctae Marthae – a guesthouse adjacent to St. Peter's Basilica, sparked environmental protests and tensions with Italy.

Frequently asked questions about the Vatican's history

When was the Vatican established as an independent state?

The Vatican City became an independent state on February 11, 1929, with the signing of the Lateran Treaty between the Holy See and Italy under Mussolini.

What was the Papal States, and how is it connected to the Vatican?

The Papal States were territories in central Italy governed by the popes from the 8th century until 1870. After Italy unified and annexed the Papal States, the pope lost temporal power until the Vatican City was later established.

Why is the Vatican considered a spiritual center for Catholics?

The Vatican is the seat of the Pope, the spiritual leader of the Roman Catholic Church, and houses St. Peter’s Basilica, built over the tomb of St. Peter, one of Jesus' apostles and the first pope.

What is the significance of the Sistine Chapel?

The Sistine Chapel is famous for its Renaissance art, especially Michelangelo’s ceiling frescoes. It is also where papal conclaves (the election of new popes) are held.

How did the Vatican accumulate wealth and power in the Middle Ages?

Through land ownership, donations, tithes, and political alliances, the Catholic Church gained vast influence across Europe, making the papacy one of the most powerful institutions in medieval times.

Has the Vatican ever been involved in political conflicts?

The papacy has been deeply involved in European politics, including wars, alliances, and conflicts such as the Investiture Controversy and opposition to certain monarchs.

Did the Vatican ever have an army?

Yes. The Papal Army existed for centuries and participated in various battles. Today, the Swiss Guard—founded in 1506—is the Vatican’s ceremonial (and functional) military force, known for their Renaissance-era uniforms.

What role did the Vatican play during World War II?

The Vatican remained officially neutral, but it has been both criticized and defended for its actions (or lack thereof) during the Holocaust and the rise of fascism in Europe.

Is the Vatican the same as the Holy See?

Not exactly. The Holy See is the governing body of the Catholic Church and predates the Vatican City. The Vatican is the physical territory, while the Holy See is a sovereign entity recognized in international law.

Does the Vatican have a secret archive?

Yes—but it's not so secret anymore. The Vatican Apostolic Archive (formerly 'Secret Archive') contains centuries of church records, papal documents, and correspondence. Scholars can request access, but much of it remains restricted.