Johannes Rühl, a farmer, and his wife Katharina settled in the Volga German colony of Volmer on 18 July 1767. They are recorded there on the 1767 census in Household No. 38.
The 1767 census records that Johannes Rühl came from the German village of Aschaffenburg in the Kurmainz region.
- 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): Vm24.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 292.