Portrait of Ferdinand duke of Brunswijk-L黱eburg; Knee piece of Ferdinand duke of Brunswijk-L黱eburg in military uniform; in an interior. His right hand is leaning on a table next to him; with divert insignia and a helmet; warfare; military affairs (commander-in-chief); commander-in-chief; general; marshal; Ferdinand duke of Brunswijk-L黱eburg; Jacob Houbraken; Amsterdam; 1775 - 1777; paper; engraving; h 193 mm x w 137 mm