Wilhelm Colas (Kollas), a miller, left the town of Wehrheim in June 1766 with his wife and three children. They arrived from Lübeck at the port in Oranienbaum on 15 September 1766 on a ship under the command of Hans Karholm.
Wilhelm died on the journey between Oranienbaum and Saratov. His widow, Katharina née Fritz, is recorded on the 1798 Census in the Volga German colony of Ober-Monjou in Household No. Om15 along with her daughter Katharina and son-in-law Johann Peter Bös and their family. Daughter Elisabeth is recorded in Household No. Om16 along with her husband Anton Rupp. Son Peter Kollas is recorded in Household No. Om71, but a note indicates that he is actually living in the colony of Louis.
- 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): Om71.
- Mai, Brent Alan, trans. & ed. Transport of the Volga Germans from Oranienbaum to the Colonies on the Volga: 1766-1767 (Lincoln, NE: American Historical Society of Germans from Russia, 1998): entries 2658-2661.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): 430.
- Struck, Wolf-Heino. "Die Rußlandauswanderung von 1766 aus den gemeinschaftlich kurtrierischen und nassau-oranischen Ämtern Camberg und Wehrheim." Nassauische Annalen 89 (1978): 255.