Valentin Bretz, a farmer, and his wife Ottilia arrived from Lübeck at the port of Oranienbaum on 29 August 1766 aboard a ship under the command of Skipper Johann Skott.
They settled in the Volga German colony of Köhler on 21 August 1767 and are recorded there on the 1767 census in Household No. 65.
In 1788, Franz Bretz moved from Köhler to Kamenka.
The Oranienbaum passenger list records that Valentin Bretz came from the German region of Pfalz. The 1767 census records that Valentin Bretz came from the German village of Mannheim.
- 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): Km076, Kl66, Kl73, Mv1312.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 376.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #3783.