Last updated 14 June 2026
History is one of the core topic areas for the Finnish citizenship test (kansalaisuuskoe), which is due to start in 2027. This page gives you a structured overview of the key periods, figures, and events — grounded in the same official sources the test draws on. It is a study companion, not legal advice.
Finland's recorded history as a political entity stretches back to the medieval period. The area that is now Finland was incorporated into the Kingdom of Sweden over the course of several centuries, with the Treaty of Nöteborg (1323) being an early landmark that formally divided the eastern territories between Sweden and Novgorod. Under Swedish rule, which lasted from at least the 13th century until 1809, Finland was an integral part of the realm — not a colony — and Swedish remained the language of administration and education. Sweden's era as a great power (roughly 1617–1721) saw it control large stretches of the Baltic region, with Finland at its core.
This long Swedish period left enduring marks: the legal tradition, the Lutheran church (Gustav Vasa broke with Rome in the 1520s), and the Swedish language all became foundations of Finnish society. Helsinki itself was founded in 1550, on the orders of Gustav Vasa, to serve as a trading rival to Tallinn on the Baltic Sea route.
Long before Finland had a state of its own, it acquired a written language. Mikael Agricola, a clergyman educated in Wittenberg under Luther's influence, is regarded as the father of written Finnish. He published the first Finnish-language book, an ABC primer known as the Abckiria, in 1543, followed by a translation of the New Testament in 1548. Agricola was appointed Bishop of Turku in 1554, making him the leading church figure in Finland at a time when Turku was both the ecclesiastical and the administrative capital of the Finnish territories. His work gave the Finnish language a standardised written form centuries before it would become an official language of government.
The Finnish War of 1808–1809 ended Sweden's rule abruptly. Russia defeated Sweden and Finland passed to the Russian Empire. Rather than absorbing Finland as an ordinary province, Tsar Alexander I established it as an autonomous Grand Duchy, confirming the existing laws and Lutheran religion at the Diet of Porvoo in 1809. Alexander declared at Porvoo that this gathering marked the beginning of Finland's political existence — a moment often cited as the birth of Finnish self-government. Finland kept its own laws, diet, and eventually its own currency. Helsinki was designated the new capital in 1812, partly to bring the administrative centre closer to St Petersburg; the old capital Turku lost its leading role also after a catastrophic fire largely destroyed the city in 1827, which accelerated the relocation of the university to Helsinki as well.
The 19th century saw a growing Finnish national movement. Philosopher and statesman J. V. Snellman (1806–1881) was a central figure: he campaigned tirelessly for the Finnish language to gain equal standing with Swedish, and he played a key role in establishing Finland's own currency, the markka, in the 1860s. The Language Decree of 1863, issued by Alexander II, set Finnish on a path toward official status alongside Swedish. Finland also experienced a devastating famine in 1866–1868: the year 1868 alone saw the population fall by more than 96,000 people, one of the worst demographic shocks in the country's history.
Toward the end of the autonomy period, Russia attempted to restrict Finland's special status through a policy of Russification. Two periods of oppression — 1899–1905 and 1909–1917 — saw imperial decrees erode the powers of the Finnish diet and limit self-government. Finnish resistance to these policies intensified the national consciousness that would soon lead to independence.
Even before independence, Finland achieved something remarkable for its era: in 1906 the diet reformed itself into a unicameral parliament with universal and equal suffrage. For the first time, women in Finland gained the right both to vote and to stand for election. The first parliamentary elections held under these rules took place in 1907. This made Finland one of the earliest countries in the world to grant women full political equality, and the unicameral Eduskunta has remained the model of Finnish democratic government ever since.
Finland declared independence on 6 December 1917, taking advantage of the political collapse triggered by the Russian Revolution. The date is now the national Independence Day, marked annually. The declaration was followed almost immediately by internal conflict: in early 1918 a civil war broke out between the socialist Reds, aligned with the labour movement, and the government-backed Whites. The war ended in a White victory in spring 1918, leaving deep social divisions that took generations to heal.
Finland became a republic in 1919, with K. J. Ståhlberg elected as the first President. The Treaty of Tartu, signed with Soviet Russia in 1920, settled the eastern border and gave Finland the northern Petsamo area in exchange for Repola and Porajärvi. The fledgling state also gained its own army through the Conscription Act of 1878 passed during the autonomy era, a foundation that would prove critical two decades later.
Finland fought three distinct wars in rapid succession. The Winter War (30 November 1939 – 13 March 1940) began when the Soviet Union invaded Finland. Despite facing overwhelming odds, Finnish forces held out for over three months before ceding territory in a peace settlement. Marshal C. G. E. Mannerheim commanded Finland's armed forces throughout both the Winter War and the subsequent Continuation War (1941–1944), in which Finland fought alongside Nazi Germany against the Soviet Union. Mannerheim became President in August 1944 as Finland negotiated its way out of the war. The Lapland War (1944–1945) then saw Finland expel German troops from the north of the country, fulfilling the armistice terms.
The peace treaties required Finland to cede significant territories, including Karelia. Around 400,000 people — virtually the entire population of the ceded areas — were resettled across Finland. Finland also paid substantial war reparations to the Soviet Union in the form of goods such as ships, trains, and industrial machinery. Ironically, producing these reparations accelerated Finland's transformation from a predominantly agrarian society into an industrialised one. J. K. Paasikivi succeeded Mannerheim as president in 1946 and pursued a policy of careful cooperation with the Soviet Union; in 1948 Finland and the USSR signed the Agreement of Friendship, Cooperation and Mutual Assistance (the YYA Treaty), which defined the two countries' relationship through the Cold War era.
Despite the shadow of its powerful eastern neighbour, Finland carved out a distinctive role in world affairs. Helsinki hosted the Summer Olympics in 1952 — the legendary Paavo Nurmi, winner of nine Olympic gold medals, lit the Olympic flame. Finland joined the United Nations and the Nordic Council in 1955. President Urho Kekkonen, who led Finland from 1956 until 1981, made Helsinki a diplomatic crossroads: in 1975 leaders from 35 countries gathered at Finlandia Hall to sign the Helsinki Final Act of the Conference on Security and Cooperation in Europe (CSCE), a landmark Cold War agreement that later became the foundation of the OSCE. Finland's reputation as a credible neutral mediator brought it international recognition far beyond its size.
Former President Martti Ahtisaari (in office 1994–2000) embodied this tradition: he was awarded the Nobel Peace Prize in 2008 for decades of international conflict mediation, including in Namibia, Kosovo, and Aceh in Indonesia.
After the Cold War ended, Finland moved steadily toward deeper integration with Western institutions. It joined the European Union in 1995, adopting euro banknotes and coins in 2002 when the single currency became physical. Finland also had its own currency, the markka, from the 1860s until 2002, when euro cash came into circulation. Russia's full-scale invasion of Ukraine in 2022 prompted a decisive shift in security policy: Finland joined NATO in April 2023, ending decades of military non-alignment and fundamentally reorienting the country's defence posture.
This page summarises publicly available historical information and links to its sources; it is informational, not legal advice. For the definitive and up-to-date requirements of the citizenship test, consult Migri.