I am looking for info about Johann Frederick Knollhoff. He was born about 1816 in Germany or Holland. His departure point was Germany, but family said he was Dutch. He married Henrietta Henkel, Margaretha Gerdes Garcke, and Maria Elmma Folke. He was in the St Louisin the 1840's and 1850's. He had one daugther with Margaretha, but the name is unknown. He had a son with Henrietta, Charles Frederick Knollhoff. No other children are known. His brother was probably Henrich Wilhelm. Except for marriage and immigration records, it does not seem to exist.