Pleasant Davis and Sarah Horton, are most likely, 4th great grandparents on RootsMagic tree.

Pleasant Davis and Sarah Horton were both born in Virginia around 1790. They married on September 9, 1806 in Virginia. Pleasant fought in the War of 1812: 87th Regiment, Virginia Militia, he was a private. An Indiana death certificate for daughter Susan Davis Black has both Peasant Davis and Sarah Horton on the record. Proving Sarah Davis -great grandma of Faber Miller- is their daughter has no factual records but has some probable records. There is the book ‘A tabulation of the descendants of Joseph Horton : a soldier of the American Revolution’ a published family history with reference to Horton Davis who went to Iowa- probably Sarah Davis’s brother. Also there is a family history compilation, not quite a book, some of it shared on Ancestry, that may be the reason Florence Miller, sister of Faber, and Ellen Mitchel 1st cousin 1x removed of Faber and Florence, wrote up notes on their ancestors to share with the person working on the family history, way before online family history existed. And Sarah Davis and Jacob Miller named sons: James Davis, Horton and Pleasant Miller; common to carry on family names, maiden names of mothers. 

Sources

• West Virginia Marriages, 1780-1970 at FamilySearch
• Indiana, Death Certificates, 1899-2011 at Ancestry 
• United States War of 1812 Index to Service Records, 1812-1815 at FamilySearch
• A Tabulation of the descendants of Joseph Horton at Archive.org  image 43, at Archive.org, page numbers are not chronological, precise