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.
Hyoronymus Ruff and his wife Theresia are recorded on the list of colonists being transported from St. Petersburg to Saratov in 1767.
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.
- Rauschenbach, Georg. Deutsche Kolonisten auf dem Weg von St. Petersburg nach Saratow: Transportlisten von 1766-1767 (Moscow: G.V. Rauschenbach, 2017): #6320-6321.