Portrait of Prince Sergei Petrovich Troubetskoy (one of the December 14, 1825 coup attempt leaders), watercolor on paper, 11x15 cm c 1815. Compare with another portrait of the same sitter at www.rulex.ru/01190083.htm and with similar portrait by the same artist of S. Muraviev-Apostol illustrated in Russkij Akvarel’nyi I Karandashnyi Portret XIXv Moscow Isobrazitelnoe Iskusstvo 1987 , N135.