Family research · Phase 20 of the world atlas

Flags of San Marino

San Marino calls itself the oldest surviving sovereign state and the oldest constitutional republic in the world — a claim resting on a founding tradition that reaches back to 301 CE, a body of statutes from 1600 still partly in force, and an unbroken record of never once being conquered, through the Renaissance, Napoleon, Italian unification, and two World Wars.

Only three eras mark this page, because San Marino's political system barely changed across seventeen centuries of self-government; its flag's white-over-light-blue bicolor and three-towers coat of arms simply became more formally fixed over time, not fundamentally different.

Scope of this page: the Republic of San Marino on Mount Titano, traditionally c. 301 CE to present, three phases. San Marino has governed itself continuously throughout its history — no internal partition, no foreign annexation ever completed. Part of a larger atlas — see the map and linked pages at the bottom.

One mountain, never conquered

San Marino's own real border around Mount Titano, traced whole — the world's smallest and one of its oldest surviving republics has governed the same small patch of the Apennines continuously since its traditional 301 CE founding. Press play, or drag the slider, to watch the flag settle from an undocumented tradition into its modern fixed form.

This is a single-region page. There is no internal-partition history to map: San Marino has never been conquered, never split, and never lost the territory it traditionally held from its founding. What changes across the three eras below is only how formally its flag and arms were fixed, not who ruled or how much ground they held.

c. 301

Traditional founding to the early commune

Real traced border on Mount Titano, no internal partition — see the rule box above for why.

white over light blue with the three towers of Mount Titano, arms fixed 1862

1862 – present

Republic of San Marino (modern arms)

Republic, treaty-recognizedNo single ruler documented (Captains Regent)Roman Catholic (traditional, no state church)

Migration & conquest:Occupied by: Germany (Sept. 1944)Immigration: Italian refugees fleeing WWII bombing (1944)

Who & why: as the Kingdom of Italy forms around it, San Marino secures its continued independence through a friendship treaty with Italy in 1862 (renewed and updated since), the same year it fixes the current form of its state arms — the three towers of Guaita, Cesta, and Montale atop Mount Titano — on the flag. The republic stays neutral through the First World War, is briefly occupied by retreating German forces for about two weeks in September 1944 despite its declared neutrality, and continues today as a functioning parliamentary republic and a founding-era relic that outlasted every empire that ever bordered it.

What it represents: white for the snow on Mount Titano's peaks, light blue for the sky above it; the three towers, crowned and wreathed with laurel and oak beneath the word LIBERTAS, mark San Marino's central civic identity — liberty defended by its own mountain fortress.

Paint guide

Proportions3:4 (state flag with arms); civil flag flown without arms at 3:4 also.

LayoutHorizontal bicolor, white over light blue, state arms (three grey towers on a green mount, crowned, with wreath and motto ribbon, simplified here) centered.

White#FFFFFF

Light blue#4AB4E6

Mount, green#4A7C3A

Towers, grey#8A8A8A

plain white-over-blue bicolor, no fixed arms yet

1600 – 1862

Republic under the 1600 Statutes

Self-governing republicNo single ruler documented (Captains Regent)Roman Catholic (traditional, no state church)

Who & why: in 1600, San Marino codifies its Leges Statutae Republicae Sancti Marini, a written constitution — among the oldest still partly in force anywhere in the world — formalizing a self-governing republic ruled by two Captains Regent elected every six months. The republic weathers the Renaissance-era ambitions of neighboring powers, and when Napoleon's armies sweep through Italy in the 1790s, he personally declines to annex San Marino, reportedly offering to expand its territory instead; San Marino, wary of the offer's strings, politely refuses.

What it represents: the white-over-light-blue bicolor is already in traditional use during this era, representing the snow-capped peak of Mount Titano beneath the open sky, though the state coat of arms is not yet fixed to a single standard design on the flag itself.

Paint guide

ProportionsNo fixed ratio recorded for this period; shown at 3:2.

LayoutHorizontal bicolor, white over light blue, no arms.

White#FFFFFF

Light blue#4AB4E6

traditional white-over-blue colors; earliest use undocumented before the medieval period

c. 301 – 1600

Traditional founding to the early commune

Self-governing republicMarinus (traditional founder)Roman Catholic (traditional, founded as a Christian refuge)

Migration & conquest:Immigration: Marinus & Christian refugees (traditional, 301 CE)

Who & why: tradition holds that Marinus, a Christian stonemason from Rab fleeing the Diocletianic persecutions, founds a small community of fellow Christians on Mount Titano in 301 CE — a date widely repeated and honored by San Marino itself (its calendar year famously runs 1,700 years ahead in local reckoning), but not independently documented. The earliest solid documentary evidence of a self-governing community on the mountain is a charter dated 885 CE; by the high Middle Ages a recognizable commune with its own statutes and elected officials is firmly attested, laying the groundwork for the formal 1600 constitution.

What it represents: no flag is documented from the earliest, legendary period of this span. The white-and-blue color scheme is traditionally associated with San Marino from deep antiquity, but its first firm attestation as a flag comes centuries later; it is shown here across this whole era as the same honest, undated tradition rather than a documented early banner.

Paint guide

ProportionsN/A — no attested flag this early; shown at 3:2 for consistency.

LayoutHorizontal bicolor, white over light blue, dashed border marking the undocumented, traditional nature of this era's flag.

White#FFFFFF

Light blue#4AB4E6

Reading the tags

Self-governing republic — sovereign commune, own statutes and elected rule

Republic, treaty-recognized — independence formalized by treaty with neighboring powers

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 San Marino 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 San Marino →

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