Johann Georg Leis, a Prussian soldier (preussischer Soldat), and his wife Katharina are recorded on an appendix to the 1767 census of Boisroux in Household No. 40 along with a note that they relocated to the colony of Meinhard in 1768.
The 1767 census records that Johann Georg Leis came from the German village of Mörs.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 169.