article: Frederick William III of Prussia
links: Prussia Morganatic marriage Alexandra Feodorovna (Charlotte of Prussia) Napoleonic Wars Potsdam Kingdom of Prussia France Alexander I of Russia House of Hohenzollern Frederick William II of Prussia Frederick William IV of Prussia Sovetsk, Kaliningrad Oblast Louise of Mecklenburg-Strelitz Unter den Linden King of Prussia Berlin George I of Great Britain Congress of Vienna William I, German Emperor Russia Frederick I of Prussia Calvinism