Family research · Phase 20 of the world atlas

Flags of Vatican City

The world's smallest sovereign state is also, in one sense, one of its oldest: the papacy held direct temporal rule over central Italy for more than a thousand years before that rule was stripped away by Italian unification, leaving the pope a self-declared "prisoner in the Vatican" for nearly sixty years until Mussolini's Italy recognized a tiny sovereign remnant in 1929.

Four eras, one institution: the sprawling Papal States, the stateless interregnum of the Roman Question, and finally the 0.49-square-kilometer Vatican City State — whose yellow-and-white flag with the crossed keys and papal tiara directly descends from the last Papal States banner flown before 1870.

Scope of this page: the papacy's own sovereign or quasi-sovereign territory, from the traditional 756 Donation of Pepin to the present, four political phases. This page tracks the Holy See's territorial and flag history specifically — not the broader history of the Catholic Church. Part of a larger atlas — see the linked pages at the bottom.

The world's smallest border, four rulers

Vatican City's own real border, traced at true scale and shape — the smallest country outline in this atlas. Press play, or drag the slider, to watch the papacy's territorial status change, era to era.

This map, like the timeline above, is scoped to Vatican City's own tiny modern 0.49 km² enclave — not the much larger Papal States that the papacy actually governed across central Italy for most of this history. Showing that real medieval and early-modern territorial extent geographically would require a wholly different map at a wholly different scale; this atlas instead keeps one fixed reference outline throughout, exactly as it does for every other country's page, and lets the color and story text carry the territorial history. During 1870–1929 the papacy held no sovereign territory of any size at all — not even this one.

756

Papal States (temporal rule, early era)

Real traced border of the modern city-state, held fixed across all four eras — see the rule box above for why. No internal partition.

yellow and white bicolor, crossed gold and silver keys under the papal tiara — adopted 1929

1929 – present

Vatican City State

Sovereign city-statePope Pius XIRoman Catholic (the state religion, headed by the Pope)

Who & why: on 11 February 1929, Pope Pius XI and Benito Mussolini's Kingdom of Italy sign the Lateran Treaty, ending the 59-year Roman Question by creating a new, deliberately tiny sovereign state — 0.49 square kilometers around St. Peter's Basilica — in exchange for the Holy See formally recognizing the Kingdom of Italy and renouncing any claim to the former Papal States. It remains the world's smallest internationally recognized sovereign state, governed by the pope as an absolute elective monarchy.

What it represents: the yellow-and-white bicolor and crossed-keys-and-tiara emblem carry over almost unchanged from the last Papal States flag, making Vatican City's banner a direct visual continuation of thirteen centuries of papal temporal symbolism rather than a new invention.

Paint guide

Proportions1:1 (square), unusually among world flags.

LayoutVertical bicolor, yellow at hoist, white at fly; the papal emblem (crossed gold and silver keys, triple-crowned tiara) centered on the white half only.

Papal yellow#FFE000

White#FFFFFF

Gold key#C9A13C

Silver key#8A8A8A

the papal flag continued in ceremonial use, but flew over no recognized sovereign soil

1870 – 1929

The Roman Question

Contested sovereigntyPope Pius IXRoman Catholic (papacy, no sovereign territory)

Migration & conquest:Conquered by: Kingdom of Italy (1870)

Who & why: on 20 September 1870, troops of the Kingdom of Italy breach the Aurelian Walls at Porta Pia and capture Rome, completing Italian unification and ending over a thousand years of papal temporal rule. Pope Pius IX refuses to recognize the new Italian state's authority or its 1871 Law of Guarantees, declaring himself a "prisoner in the Vatican" and confining himself and his successors to the Apostolic Palace for nearly sixty years, until the 1929 Lateran Treaty finally resolves the standoff.

What it represents: the papacy continues to fly and use its yellow-and-white flag and crossed-keys emblem privately within the Vatican precincts throughout this period, but it corresponds to no sovereign territory recognized under international law — a flag without a state, shown here washed out and dashed to mark that gap.

Paint guide

ProportionsN/A — no recognized state flag during this period.

LayoutShown here as the same yellow/white papal colors, faded and outlined with a dashed border to mark the absence of sovereign territory.

Papal yellow (faded)#FFE000

Dashed border, muted#6E6047

yellow and white with crossed keys, adopted by the restored Papal States, 1825

1825 – 1870

Papal States (restored, pre-unification)

Papal territory, temporal rulePope Leo XIIRoman Catholic (the state religion, headed by the Pope)

Who & why: after Napoleon's fall, the 1814–15 Congress of Vienna restores the Papal States to papal rule across a broad swath of central Italy. Pope Leo XII formally adopts the yellow-and-white bicolor with the crossed keys and tiara as the state's flag in 1825, replacing the older red-and-gold gonfalone. The restored state survives the revolutions of 1848 and Italy's early unification wars, shrinking as the peninsula consolidates around it, until Rome itself falls in 1870.

What it represents: the crossed keys of Saint Peter and the triple-crowned tiara, on a yellow-and-white field, become the settled papal ensign in this era — the same design Vatican City still flies today, unbroken since 1825.

Paint guide

ProportionsNo fixed civil ratio recorded; shown as a square field consistent with the later Vatican standard.

LayoutVertical bicolor, yellow at hoist, white at fly, crossed gold and silver keys and tiara on the white half.

Papal yellow#FFE000

White#FFFFFF

Gold key#C9A13C

gold and red gonfalone — the traditional colors of Rome (SPQR), used before 1825

756 – 1825

Papal States (temporal rule, early era)

Papal territory, temporal rulePope Stephen IIRoman Catholic (the state religion, headed by the Pope)

Migration & conquest:Conquered by: Napoleonic France (1809–14)

Ruling house:House of BorgiaHouse of FarneseHouse of Barberini

Who & why: in 756, the Frankish king Pepin the Short defeats the Lombards and grants a band of central Italian territory to the pope — the traditional founding of over a thousand years of direct papal temporal rule, formalized in later centuries as the Papal States. Through the medieval and early modern periods the papacy governs this territory as a secular prince alongside its spiritual role, including a brief interruption when Napoleon's France annexes the Papal States outright from 1809 to 1814, before the papacy is restored at the Congress of Vienna.

What it represents: for most of this long era the papal gonfalone uses gold and red — the ancient colors of the city of Rome (SPQR) — rather than the yellow-and-white familiar today; the crossed-keys-and-tiara yellow-white flag only becomes standard after the 1815 restoration. Exact banner designs varied considerably across this millennium and are only loosely reconstructed here.

Paint guide

ProportionsNo fixed ratio recorded across this span; shown at 3:2.

LayoutHorizontal bicolor, gold over red — an informed reconstruction of the traditional Roman gonfalone colors, not a single fixed specification.

Gold#C9A13C

Red#A4302A

Reading the tags

Papal territory, temporal rule — the pope as a sovereign secular prince

Contested sovereignty — no recognized territory, standoff with Italy

Sovereign city-state — internationally recognized micro-state

Leader — the named ruler most associated with the era's start

State religion — the official/established faith, not the population's

Find the records

Family history research for Vatican City lives in a different project, Record Atlas, which maps which archive actually holds the paper for a given place and era.

Search Record Atlas for Vatican City →

More of the atlas

This page is one lineage in a larger set. See the region-wide map and the other countries here:

Flags Atlas indexSearch every country and hub Microstates hubEurope's smallest sovereign states