Johann Kaspar Grünwald was born on 4 February 1723 in Gross-Felda, today part of the combined administrative town of Feldatal, southwest of Alsfeld. He married there on 12 August 1744 to Anna Katharina Eissfelder.
Kaspar arrived in Frank in 1767 with his wife and 3 children. They are recorded there on the 1767 Census in Household No. 65.
Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 429.
Pleve, Igor. Grünwald Family Chart.