Johannes Hartmann, a farmer, and his family arrived from Lübeck at the port of Oranienbaum on 13 September 1766 aboard a ship under the command of Skipper Johann Grapp.
They settled in the Volga German colony of Rothammel on 6 September 1767 and are recorded there on the 1767 census in Household No. 25.
In 1788, widower Johannes Hartmann and his son Sebastian moved from Rothammel to Semenovka.
The 1767 census records that Johannes Hartmann came from the German village of Briedel in the Trier 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): Rt10, Mv2490.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 86.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #5885.