Franz Karl, a cloth weaver (Tuchweber), and his wife Maria are recorded on an appendix to the 1767 census of Nieder-Monjou.
Franz Karl and his family are recorded on the 1798 census of Zug in Household No. 20.
The 1767 census records that Frank Karl came from the German region of Den Brand.
- 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): Zg20.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 210.