What country does Louis de Silvestre and Augustus II the Strong have in common?
Louis de Silvestre:  He was court painter to King Augustus II of Poland, and director of the Royal Academy of Arts in Dresden. Augustus II the Strong:  der Starke" ; Polish: "August II Mocny" ; Lithuanian: "Augustas II" ; 12 May 1670 – 1 February 1733) of the Albertine line of the House of Wettin was Elector of Saxony (as Frederick Augustus I), Imperial Vicar and elected King of Poland and Grand Duke of Lithuania.
Poland