Jakub Lange - a Calvinist, and a son of a teacher - came to Warsaw from the Swiss canton of Grisons around the half of the 19th century. His life resembles the life of Stanislaw Wokulski, the protagonist 'The Doll' by Boleslaw Prus. Jakub Lange is likely to be the model for the main character of the novel. At the beginning of his stay in Warsaw, Lange probably took up smithery, and later made his living as a patisserie worker. After 1873 he owned a patisserie in Warsaw at 10 Chlodna Street. In 1868, as a shareholder of the Kantor partnership that supplied bread to the Russian army, he got to Bulgaria, where - like Wokulski - came into fortune during nine months. Lange was married twice. His first wife Anna, a Catholic (their children were also Catholics), died at the age of 40. His second marriage with Emilia, a Lutheran, lasted only a few months since Jakub died February 22, 1883.