Christoph Ruber, his wife, and 2 children immigrated to Schleswig-Holstein (Denmark), arriving on Flensburg 19 June 1762. They deserted the Danish colonies on 27 April 1765 and joined the migration to Russia.
They settled in the Volga German colony of Dönhof on 21 July 1766 and are recorded there on the 1767 census in Household No. 13.
The 1767 census records that Christoph Röber [sic] came from the German village of Wittenberg in the region of Sachsen (Saxony). The Eichhorns record that Christoph Ruber came from the village of Kleingartach near Brackenheim in the Württemberg region.
There are no known surviving male descendants of this Ruber family among the Volga German colonies.
- Eichhorn, Alexander, Jacob & Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen, Germany: Drukerei und Verlag Steinmeier GmbH & Co. Kg, 2012): B-1383.
- Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767 Band 1 (Goettingen: Der Göttinger Arbeitskreis, 1999): 344.