Johann Kaspar Probst, a craftsman (Handwerker), and his wife Anna Margaretha settled in the Volga German colony of Reinhard on 15 July 1766. They are recorded there on the 1767 census in Household No. 14.
In 1783, Karl [Kaspar?] Probst moved from Reinhard to Saratov. By 1798, he was in Orenburg.
The 1767 census records that Johann Kaspar Probst came from the German region of Hanstedt.
- 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): Mv2327.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 23.