Johann Georg Leonhard, a farmer, and his family arrived from Lübeck at the port of Oranienbaum on 8 August 1766 aboard a pink under the command of Lieutenant Moisey Davydov.
They settled in the Volga German colony of Köhler on 21 August 1767 and is recorded there on the 1767 census in Household No. 80.
In 1790, Franz Leonhard moved from Köhler to Semenovka.
The 1767 census records that Johann Georg Leonhard came from the German village of Kirchberg in the Baden 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): Kl59, Kl74, Se05, Mv1317.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 379.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #4184.