Olga's Gallery
Dmitry Levitzky.
Portrait of M. I. Mussar.
1790s. Oil on canvas. The Tretyakov Gallery, Moscow, Russia. More. 
Mussar, Maria Ivanovna (dates of life unknown), née Hetz (or Getz), wife of St. Petersburg watchmaker and merchant Daniil Francois Mussar, who had come to Russia from Geneva as a boy. Their daughter, Barbara Danilovna, was married to the Russian author N.I. Grech