1837:William Avery Rockefeller, Sr. married Eliza Davison on February 18 in Niles, Cayuga County, NY. 
William, having abandoned his family, became a bigamist:
1865:Margaret Allen married William Levingston (a pseudonym of William A. Rockefeller, Sr. who was still married to his first wife, Eliza Davison) in 1856 in Norwich, Ontario, Canada. They had no children together. 
William also fathered two daughters (Clorinda and Cornelia Rockefeller) with another woman, Nancy Brown, to whom he was never married.
William Rockefeller spent some time in Park River, North Dakota under the Levingston alias. He died on May 11, 1906, in Freeport, Illinois and was buried there in Oakland Cemetery. John D. Rockefeller never publicly acknowledged the truth about his father's life as a bigamist, and William's grave marker was paid for out of his second wife's estate. 
1906:William Levingston (William Avery Rockefeller Sr) is buried with his second wife Margaret L. Levingston in the Oak Knoll section of Oakland Cemetery in Freeport, Stephenson County, Illinois. 
Wikipedia: "William Avery "Bill" Rockefeller Sr. was an American con man who went by the alias of Dr. William Levingston. he worked as a lumberman and then a traveling salesman who identified himself as a "botanic physician" and sold elixirs. Two of his sons were Standard Oil co-founders John Davison & William Avery Jr."
Michael Gabbard, firsthand knowledge. Click the Changes tab for the details of edits by Michael and others.
"United States Census, 1840," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XHTN-121 : 2 March 2021), William Rockafeller, Richford, Tioga, New York, United States; citing p. 104, NARA microfilm publication , (Washington D.C.: National Archives and Records Administration, n.d.), roll ; FHL microfilm .
Find a Grave, database and images (accessed 15 January 2021), memorial page for Dr William Avery “Dr. William Levingston” Rockefeller (13 Nov 1810–11 May 1906), Find A Grave: Memorial #5034173, citing Oakland Cemetery, Freeport, Stephenson County, Illinois, USA ; Maintained by Cecil Munsey (contributor 12999932) .
Is William your ancestor? Please don't go away! Login to collaborate or comment, or
a profile manager, or ask our community of genealogists a question.
Sponsored Search by Ancestry.com
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: