Keywords: Valentin Jameray-Duval.jpg artwork Valentin Jameray-Duval<br> detail Franz Stephan sitting together with his natural science advisors From left to right Gerard van Swieten Johann Ritter von Baillou Valentin Jamerai Duval numismatist and Abbé Johann Marcy Naturhistorisches Museum Wien Painting own James Steakley 2011 09 18 Franz Messmer portraits and Jakob Kohl background 1773 2-dimensional facsimile of a work older than 100 years own photography 250px 18th-century portrait paintings of men at three-quarter length Franz Messmer Valentin Jamerey-Duval PD-old-100 |