Dr. Warren was married to Louisa/Mary Louise Nichols

The evidence

• “Ho was reared a Presbyterian, though not a member of any church, and believes in the principles of Christianity as inculcated by his mother. He married Dec. 18, 1854, Miss Louisa M. Nichols, daughtfr of his old preceptor; they have two sons and five daughters — Ilcrbert N.”

  1879-history-of-rock-county/17-bios-janesville.md, PDF p. 723 / book p. 727

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources