Johann Caspar Greb was baptized on 17 May 1743 in Engelrod, which was then part of the territory ruled by the Barons of Riedesel. He is the son of Johann Caspar Greb.
Johann Caspar migrated to Russia in 1766 and arrived in Oranienbaum (now Lomonosov) on 19 July 1766 aboard the ship "Kargopol" (Cargo) under the command of Moses Davydov. At the time, Johann Caspar was single and worked as a joiner.
Johann Caspar married Elisabeth Margaretha Koch during transport to the Volga settlement area. They arrived in the colony of Kraft on 18 August 1767. The 1767 census notes that Heinrich Koch, age 19, is living in the same household (number 15) as Johann Caspar and Margaretha. Heinrich is the brother of Margaretha Koch. Living adjacent to Johann Caspar in household 14 is Georg Heinrich Schreiner, who is also from Engelrod and traveled to Russia aboard the same ship.
By the time of the 1798 census, Johann Caspar had moved to the colony of Müller and is listed in household 6 along with his wife and four children. His eldest son is named Georg Heinrich, likely after his friend from Engelrod and fellow colonist, Georg Heinrich Schreiner.
Some members of the Greb family relocated to Wiesenmüller prior to the 1857 census.
It is possible that Johann Caspar Greb is related to Johannes Gräb who is from Windhausen and settled in the colony of Stephan in 1767. The mother of Johannes Gräb is Catharina Döring from Engelrod. Engelrod is located about 7 miles from Windhausen.
Parish records of Engelrod on Archion.de.
Idt, Andreas and Rauschenbach, Georg. Auswanderung deutsche Kolonisten nach Russland im Jahre 1766 (Second edition). Moscow: 2019. Page 31, No. 37.
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). Volume 1, Page 736.
Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 - Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): Page 397.
Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): Page 276.