The Treaty of Fredrikshamn, or the Treaty of Hamina, was a peace treaty concluded between Sweden and Imperial Russia on 17 September 1809. The treaty concluded the Finnish War and was signed in the Finnish town of Fredrikshamn (Hamina). Russia was represented by Nikolay Rumyantsev and David Alopaeus (Russian ambassador to Stockholm), while Sweden by Infantry General Kurt von Stedingk (former Swedish ambassador to Saint Petersburg) and Colonel Anders Fredrik Skjöldebrand.
In the treaty, Sweden ceded Finnish territories to Russia.
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