Tobias Friedrich Markus, a soldier (Soldat), and his family settled in the Volga German colony of Schulz on 8 September 1766. They are recorded there on the 1767 census in Household No. 2.
The 1767 census records that Tobias Friedrich Markus came from the town of Stettin in the region of Prussian Pomerania.
- 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): Sz16, Sz22.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 119.