Marty, The infois from the family.The Christian Frederick Rupnow birth (April-1812)is found in the area of Schlangenthin, Arnswalde, Pommern. Christian's son, Wilhelm Fredrich was born 13-May-1830.(I made a note after his birth Jagow-Stettin) I don't have the date of their immigration, but they were married in Wis. in in 1874. Aug.-1874. My map is not good and I cannot tell you how close Marienwalde and Arnswalde are to one another.
In the IGIthe Rupnow name is listed under Rubnow. I have not looked at this for a long time. Irene