Caption:
Frederick William, 1620 - 1688, Elector of Brandenburg and Duke of Prussia, thus ruler of Brandenburg-Prussia, from 1640 until his death in 1688. "Curonian Lagoon, January 10, 1679". (War between Sweden and Brandenburg 1675-79: The Elector of Brandenburg in a sleigh, in persuit of the Swedish army near Riga known as the "The Great Sleigh Drive"). Painting, c.1886, by Wilhelm Simmler. Formerly Berlin, Armoury (Hall of Fame).