Johann Peter Rosenbach, a farmer, and his family arrived in Lübeck at the port of Oranienbaum on 9 August 1767 aboard the pink Novaya Dvinka under the command of Lieutenant Perepechin.
In 1796, widow Charlotta Rosenbach and her family moved from Köhler to Semenovka.
The Oranienbaum passenger list records that Johann Peter Rosenbach came from the German district of Darmstadt.
- 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): Kl25, Kl26, Kl47, Se47, Mv1336.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 372.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #3884.