I would be very interested in communicating with you regarding Dorothea Sophia Lau who was married to Johann KRENZ . They had a daughter, also named Dorothea Sophia KRENZ who was married to Samuel Joachim Heinrich JAHNS. From the information that I have, they were married in Posen or Germany, but their first born son was born in Marathon County in Wisconsin in 1856.
I am researching the JAHNS family in Green Lake County, which I believe is related to JAHNS family of Marathon County - we just haven't found the common link yet. I can also put you in touch with the person(s) who has researched the Daniel Joachim JAHNS in Marathon County, WI.
My nephew is researching the Krossakel, Posen, Prussia area by viewing films at the LDS, trying to locate our JAHNS family and has also found the KRENZ surname. We look forward to hearing from you.
You can contact me directly at firstname.lastname@example.org