According to the treaty Sweden ceded parts of the provinces Lappland and Västerbotten (east of Tornio River and Muonio River), Åland, and all provinces east thereof. The ceded territories came to constitute the Grand Duchy of Finland, to which also the Russian 18th century conquests of Karelia, including small parts of Nyland and Savonia (later to be called "Old Finland"), were joined in 1812 as Viborg County. Together with the Diet of Porvoo (1809), and the Oath of the Sovereign, the Treaty of Fredrikshamn constitutes the cornerstone for the autonomous Grand Duchy, its own administration and institutions, and thereby a start of the development which would lead to the revival of Finnish culture, to equal position of the Finnish language, and ultimately in 1917 to Finland's independence.