Isaak Dubois, a teacher of French (Schulmeister der französischen Sprache), his wife Johanna Gertrude, and children (Ernst Friedrich, age 17; Helena, age 7) are recorded on the 1767 census of Katharinenstadt in Household No. 26. They had settled there on 27 August 1766.
Isaak du Bois is recorded on the 1776 Katharinenstadt Grundbuch [Land Register] in Household No. 28 along with a note that he has been beurlaubt [on leave] in Penza since 1770 and died in 1789. He is recorded with his son Ernst (age 23), his wife Anna Maria (age 21), and son Johann (age 2) along with a note that another son Johann Heinrich was born 11 November 1776.
The 1767 census records that Isaak Dubois is from the German town of Berlin in Brandenburg, and Johanna Gertrude is from the German town of Schönebeck in the Magdeburg region. The 1776 Katharinenstadt Land Register records that Isaak du Bois came from the Mittelmarkt neighborhood in Berlin. It records also that son Ernst from the German village of Schönebeck near Magdeburg and Ernst's wife came from the village of Hallenburg in the region of Westfalen.
- 1776 Katharinenstadt Grundbuch [Land Register] (Household No. 28).
- 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): Ka031.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Der Göttinger Arbeitskreis, 2001): 282.
Brent Mai