Count Dmitrii Pavlovich Tatishchev was Russian Ambassador in Vienna from 1826 to 1841. In 1813 he married Julia Aleksandrovna Konopka and in 1840 he lost his eyesight.
For other portraits of Tatishchev, see G. Kugler, Staatskanzler Metternich und seine Gäste, Graz, 1991, pl. 51 (by Daffinger, 1837) and Grand Duke Nicholas Mikhailovich Romanov, Russkie portrety, St. Petersburg, 1905-1909, I, 160, and sale Christie's, London, 28 May 2002, lot 197. A miniature of his wife by Daffinger is illustrated in K. V. Mikhailova/G. V. Smirnov, Portrait Miniatures from the Russian Museum, Leningrad, 1974, II, no. 31, pl. 89, pp. 182-183, 364.