Johann Bolk (age not recorded) settled in the Volga German colony of Schäfer on 1 August 1766. He is recorded there on the 1767 census in Household No. 42 along with his mother and stepfather, Johann Hermann.
The 1767 census records that his mother Maria Rosina came from the German village of Bernburg in the region of Sachsen (Saxony).
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 100.