Johann Leonhardt, a farmer, and his family arrived from Lübeck at the port of Oranienbaum on 8 August 1766 aboard a ship under the command of Skipper Martin Friedrich Morkau.
They settled in the Volga German colony of Urbach on 3 July 1767 and are recorded there on the 1767 census in Household No. 35.
Christian Leonhardt (age 22), presumed son of Johann Leonhardt, is recorded on the 1798 census of Urbach in Household No. Ur29.
The 1767 census records that Johannes Leonhardt came from the German region of Trier.
- 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): Ur29.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 278.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #2956.