Johannes Kohler, his wife Margaretha, and son Johannes (age 20) immigrated to Denmark (Schleswig-Holstein) arriving in the city of Schleswig on 9 May 1761. Son Johannes married in May 1761 to Barbara Kaiser.
They joined the migration to Russia and settled in the Volga German colony of Grimm. They are recorded there on the 1775 census in Household No. 34.
The Eichhorns record that Johannes Kohler came from the German region of Baden-Durlach.
- 1775 Census of Grimm (No. 34)
- Eichhorn, Alexander, Jacob & Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen, Germany: Drukerei und Verlag Steinmeier GmbH & Co. Kg, 2012): B-854.
- 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): Gm061.