Widower Joseph Mattias is recorded on the 1798 census of Krasnoyar in Household No. Ks005 along with a note that he is working in Louis.
There are no known surviving male lines of this Mattias family among the Volga German colonies.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Ks005.