I need information on Birkenfelde & Gross Sobrost, both located in Kreis Gerdauen. I think that they belong to Russia now. My great grandmother, Marie Terketzky, was born in Birkenfelde on 19 April 1863 to Gottlieb Terketzky & Wilhelmine Kossmann, who were from Gross Sobrost. I would like information, and I would like to know the jurisdiction at that time & at the present (Kreis Gerdauen,?, Ostpreussen).
Any information would be appreciated.
Please let me know.