Could this be the William Madison who resided with Alexander S. and Catherine B. Taliaferro in Madison County, Virginia in 1850? [1]
RESEARCH NOTE: William is listed with the Taliaferro family on the 1850 Census form for Madison County [United States 1850 Census. Online database. AmericanAncestors.org. New England Historic Genealogical Society, 2014. (Original index: United States Census, 1850. FamilySearch, 2014.) - https://www.americanancestors.org/DB1665/i/39308/195/1032181370]
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