Event

Diet of Porvoo

1809 · 19th century · Also known as Diet of Borgå

The Diet of Porvoo was the assembly of the four estates of Finland that met at Porvoo in 1809, during the Finnish War. Emperor Alexander I of Russia promised to uphold Finland's laws, Lutheran religion and privileges, and the estates swore allegiance to him as Grand Duke. It is regarded as the founding moment of the autonomous Grand Duchy of Finland.

Diet of Porvoo
Image: Emanuel Thelning · Public domain · Wikimedia Commons

Mentioned in 1 state history

Grand Duchy of Finland

See also

Cite this entry
APA
The Epoch Institute. (2026). Diet of Porvoo. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/diet-of-porvoo
MLA
“Diet of Porvoo.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/diet-of-porvoo. Accessed .
Chicago
The Epoch Institute. “Diet of Porvoo.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/diet-of-porvoo.
Harvard
The Epoch Institute (2026) ‘Diet of Porvoo’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/diet-of-porvoo (Accessed: ).

Last reviewed October 2026Random entry ↻