Johann Adam Ungeheuer, a farmer, and his wife Katharina arrived from Lübeck at the port of Oranienbaum on 31 May 1766 aboard the pink Slon under the command of Lieutenant Sergey Panov.
They settled in the Volga German colony of Leitsinger on 12 May 1767 where they are recorded on the 1767 census in Household No. 12.
The 1767 census records that Johann Adam Ungeheuer came from the German village of Etzenheim in the Kurtrier region.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 65.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #609.