Johann Friedrich Lange, a soldier (Soldat), his wife Katharina Dorothea, and stepdaughter Katharina Dorothea [surname not recorded] (age 11) settled in the Volga German colony of Kratzke on 7 August 1766. They are recorded there on the 1767 census in Household No. 25.
The 1767 census records that Johann Friedrich Lange came from the German village of Kiel in the Holstein region.
There are no known surviving male lines of this Lange family among the Volga German colonies.
- Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767 Band 2 (Goettingen: Der Göttinger Arbeitskreis; 2001): 455.