1809 King Gustav IV Adolf of Sweden abdicates after a coup d'état. At the Diet of Porvoo, Finland's four Estates pledge allegiance to Alexander I of Russia, commencing the secession of the Grand Duchy of Finland from Sweden.
1848 First performance of Finland's national anthem.
1918 Finland's "Mosaic Confessors" law went into effect, making Finnish Jews full citizens.
1939 World War II: Germany and the Soviet Union sign a non-aggression treaty, the Molotov-Ribbentrop Pact. In a secret addition to the pact, the Baltic states, Finland, Romania, and Poland are divided between the two nations.
1940 Finland initiates Winter War peace negotiations
1982 Estonian Communist Party bureau declares "fight against bourgeois TV" — meaning Finnish TV — a top priority of the propagandists of Estonian SSR
2007 Jokela school shooting in Tuusula, Finland, resulting in the death of nine people.