Episode 2 of 2

Opening of the Diet

When: 29 March 1809
Where: Porvoo (Borgå)
Part of: Diet of Porvoo: Finland's Estates pledge allegiance to Alexander I

On 29 March 1809 the four Estates assembled in Porvoo and pledged allegiance to Alexander I, opening the Diet that established the Grand Duchy.

By 1809 all of Finland had been conquered and the Diet was summoned in March. During the Finnish War, the four Estates of Russian-occupied Finland—nobility, clergy, burghers and peasants—were assembled in Porvoo by Tsar Alexander I, the new Grand Duke of Finland, between 25 March and 19 July 1809. On 29 March 1809 they pledged allegiance to him. The session lasted from March to July 1809.

Sources

Grand Duchy of Finland Wikipedia, revision of 2026-09-16
Diet of Porvoo Wikipedia, revision of 2026-09-23

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.