The Treaty of Nystad reference article from the English Wikipedia on 24-Jul-2004
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Treaty of Nystad

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The Treaty of Nystad (1721), signed at the present-day Finnish town Uusikaupunki, ended the Great Northern War, in which Russia received the territories of Estonia, Livonia and Ingria, as well as much of Karelia and Tsar Peter I of Russia replaced King Frederick I of Sweden, as ruler of the conquered provinces. It marked the advent of Russia as a world power in place of Sweden. The conflict with the other parties, Hannover, Kingdom of Prussia and Denmark had been concluded by the Stockholm treaties in 1719 and 1720.

See also: Uusikaupunki