Johann Martin Schäfer (born 1745) was from Kestrich, Hessen-Darmstadt. He married in Büdingen, Germany, on 24 February 1766 to Anna Margaretha Diehl (Tiehll/Thiel), from the village of Hochst, Wetterau-Hesse, Germany. The Diehl lineage can be traced back several generations to Johann Peter Diehl and Anna Elisabeth Höyer of Düdelsheim, Nidda-Hesse, Germany. Martin Schäfer is recorded on the on the 1767 census of Frank in Household #9.
- Mai, Brent Alan and Dona Reeves-Marquardt. German Migration to the Russian Volga (Lincoln, NE: American Historical Society of Germans from Russia, 2003): 44.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 2001): 420.