FTP, give the common name shared by these kings, respectively an 18th century Holy Roman Emperor and 19th century Belgian monarch.
One monarch of this name and regnal number was the son of Francis I and Maria Theresa, and brother of Joseph II and Marie Antoinette.   The other was originally named Louis Philippe Marie Victor, was married to the Austrian princess Marie Henrietta, and financed Lord Henry Stanley's trip along the Congo River.  FTP, give the common name shared by these kings, respectively an 18th century Holy Roman Emperor and 19th century Belgian monarch.
One monarch of this name and regnal number was the son of Francis I and Maria Theresa, and brother of Joseph II and Marie Antoinette.   
Leopold II