Michael Boltz, his wife Maria, and son Wendel (age 1) immigrated to Denmark (Schleswig-Holstein) arriving in Flensburg on 9 June 1762. They are last recorded among the Danish colonies on 12 January 1765.
They joined the migration to Russia and settled in the Volga German colony of Dönhof on 21 July 1766. They are recorded there on the 1767 census in Household No. 7.
The 1767 census records that Michael Boltz was a farmer from the German region of Baden-Durlach. The Eichhorns record that Michael Boltz was a linen weaver (Leinweber) from "Markgrafschaft Baden-Durlach."
- 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-154.
- 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): Dh068.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 343.