Johann Conrad Werth, son of Johann Heinrich Werth, was baptized in Spielberg on 24 December 1747. His sister, Eva Elisabeth, had been baptized there on 7 April 1745.
Johann Conrad and his sister, who had married Conrad Preisendorf, immigrated to Russia arriving at the port of Oranienbaum on 8 August 1766. They all settled in the Volga German colony of Norka.
- Parish records of Spielberg.