Heronimous Ruf, a farmer from the Pfalz, and his wife Theresia arrived from Lübeck at the port in Oranienbaum on 13 September 1766 aboard a ship with skipper Johann Grapp at the helm.
They settled in the Volga German colony of Dietel where their children are recorded on the 1798 census.
- 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): Dt70.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): 375.