Nikolaus Rudolf, a farmer, and his family arrived from Lübeck at the port of Oranienbaum on 18 June 1766 aboard the ship Die Perle under the command of Skipper Thomson.
They settled in the Volga German colony of Leichtling on 14 May 1767 and are recorded there on the 1767 census in Household No. 46.
In 1790, Franz Rudolf moved from Leichtling to Pfeifer.
The 1767 census records that Nikolaus Rudolf is from the German region of Neustadt.
- 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): Lg42, Pf81, Mv1538.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 61.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #1065.