Jakob Theiss from Schaffhausen and his wife are recorded on the 1798 census of Katharinenstadt in Household No. Ka036.
The death of Jakob Theiss in 1831 is recorded on the 1834 census of Katharinenstadt in Household No. 39.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Ka036.