Frederick_William,_Margrave_of_Brandenburg-Schwedt--Czar_of_Russia_Alexander_I

Frederick William of Brandenburg-Schwedt (17 November 1700 – 4 March 1771) was a German nobleman. In his lifetime, from 1711 to 1771, he held the titles Prince in Prussia and Margrave of Brandenburg, with the style Royal Highness. He was made a knight of the Order of the Black Eagle.
In the 19th century he was retrospectively known by the title Margrave of Brandenburg-Schwedt, in order to differentiate his branch of the Hohenzollern dynasty. He was the second owner of the Prussian secundogeniture of Brandenburg-Schwedt. His parents were Philip William, Margrave of Brandenburg-Schwedt, and Princess Johanna Charlotte of Anhalt-Dessau. He was the nephew of King Frederick I of Prussia.