Erasmus Krämer, a farmer, and his wife Franziska arrived from Lübeck at the port of Oranienbaum on 8 August 1766 aboard the snow-brig Der Merkur under the command of Skipper Johann Heinrich Abelmann.
They settled in the Volga German colony of Sewald on 20 August 1767 and are recorded there on the 1767 census in Household No. 34.
In 1790, Johann Georg Krämer moved from Sewald to Rothammel.
The 1767 census records that Erasmus Krämer came from the German village of Neustadt in the Pfalz region.
- 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): Rt02, Sd14, Sd26, Mv2752.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 174.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #3323.