Leonhard Schwemmling, a farmer, and his wife Anna Maria settled in the Volga German colony of Mariental on 14 June 1766. They are recorded there on the 1767 census in Household No. 46.
The 1767 census records that Leonhard Schwemmling came from the German village of Steinbach in the Zweibrücken region.
There are no known surviving male descendants of this family among the Volga German colonies.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 106.