Johann David Henn, son of Johannes & Maria Magdalena Henn, was born and baptized on 22 July 1716 in Weiler (today known as Weiler an der Zaber), west of Brackenheim. He married Anna Rosina Gruber, daughter of Johann Christoph & Anna Barbara Gruber, on 17 June 1751 in the Weiler Lutheran Church. Anna Rosina was born on 2 October 1728 and baptized on 3 October 1728 in Weiler.
Johann David & Anna Rosina had a son, Johann Christoph, who was also born and baptized in Weiler, on 9 March 1752 and 10 March 1752 respectively.
Johann David and his family immigrated to Denmark (Schleswig-Holstein), departing from Altona, Duchy of Holstein, on 7 June 1762 under the leadership of Christoph Paquet. They arrived in the city of Flensburg, Duchy of Schleswig, on 12 June 1762. At some point after 22 April 1765 they immigrated to Russia.
Johann David Henn and his family arrived in the Volga German colony of Reinwald , where they are recorded on 1766 census in Household No. 21.
Only Johann David and his wife Anna Rosina Gruber are registered on Reinwald 1798 census in Household No. Rw57.
Eichhorn, Alexander; Eichhorn Jacob & Mary. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen: Steinmeier, 2012): 305, 450, & 680.
Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999).
Parish records of Weiler (OA. Brackenheim) - LDS Film No. 1184767.
Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 35.