Michael Leonhard, a musician (Musiker), and his wife Ursula and her children from a previous marriage (surname not recorded) settled in the Volga German colony of Degott on 18 July 1766. They are recorded there on the 1767 census in Household No. 9.
The 1798 census of Franzosen records Johann Leonhardt from Degott in Household No. Fz20.
Between 1816 and 1834, Johannes Leonhardt and his family moved from Franzosen to Kamenka.
The 1767 census records that Michael Leonhard came from the Danish town of Kopenhagen (Copenhagen).
- 1834 Franzosen Census (Household No. 43).
- 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): Dg08, Fz20.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 265.