Jakob Mockler, a gardner (Gärtner), and his wife Elisabeth settled in the Volga German colony of Katharinenstadt on 27 August 1766. They are recorded there on the 1767 census in Household No. 115.
The 1767 census records that Jakob Mockler came from the German village of Bluoa.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 301.