Just Unterberg, a farmer, and his family arrived from Lübeck at the port of Oranienbaum on 4 July 1766 aboard the English frigate Love & Unity under the command of Skipper Thomas Fairfax.
They settled in the Volga German colony of Paulskaya on 7 June 1767 and are recorded there on the 1767 census in Household No. 79.
In 1794, Wilhelm Unterberg moved from Paulskaya to Biberstein.
The Oranienbaum passenger list records that Just Unterberg came from the German region of Darmstadt while the 1767 census records that Johann Just Unterberg came from the German village of Herzhausen.
- 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): Bb22, Pl47, Mv2235.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 349.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #1452.