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On 22 November 1747 he married, in Saint Petersburg, Maria Aurora von Mengden (born 1720), daughter of friherre Magnus Gustav von Mengden (1663–1726), former Lord Marshal of Swedish Livonia.
In addition to these terms, the treaty also included secret articles: therein, Frederick William I accepted Swedish claims to the Baltic coastal areas between Prussia and Swedish Livonia, namely Courland, Lithuania, Samogitia and Semigallia.