Looking for Ancestors of Anna Gust

Anna Gust was from Germany. She was born in 1842 and died in 1872.
She married Benheldt Feldkamp who also was from Prussia. They had four children. B. Feldkamp was born in 1830 and died in 1881. He remarried after Anna's death. His second wife was Augusta Treab.

They lived in Jasper County, Illinois near the town of Montrose, Illinois.

I would be interested in hearing from anyone concerning the ancestors of Anna and Benheldt Feldkamp.