Jakob Leonhard arrived from Lübeck at the port of Oranienbaum on 22 August 1766 aboard a galliot named Eva Maria under the command of Skipper Franz Christopher Schröder.
Jakob Leonhard, a farmer, and his wife Sophia are recorded on an appendix to the 1767 census of Beauregard in Household No. 2.
Widow Sophia Leonhard and her son Johann Martin are recorded on the 1798 census of Zug in Household No. Zr27.
The 1767 census records that Jakob Leonhard came from the German village of Leer.
- Idt, Andreas and Georg Rauschenbach. Auswanderung deutscher Kolonisten nach Russland im Jahre 1766 (Moscow: Idt & Rauschenbach, 2019): 34.
- Idt, Andreas and Georg Rauschenbach. Deutsche Kolonisten im Jahr 1766 in Oranienbaum und in den Siedlungsorten: Die Kuhlberg-Listen (Moscow: Idt & Rauschenbach, 2024): 845.
- 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): Zr27.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Der Göttinger Arbeitskreis, 1999): 195.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #6845.
- Rauschenbach, Georg. Deutsche Kolonisten auf dem Weg von St. Petersburg nach Saratow: Transportlisten von 1766-1767 (Moscow: G.V. Rauschenbach, 2017): #4219.
Brent Mai