Martha (Patsey) Smith, daughter of Peter Smith of Caswell County, North Carolina, married Levi Blackwell in Caswell County, North Carolina, February 16, 1799. Levi was born before 1775; died in Caswell County in 1819; was the son, of Robert and Zilla Blackwell. A lot is said about the Blackwell family in Caswell County, North Carolina Wills, 1779-1850, by Elizabeth Dixon. The State map shows a town by the name of Blackwell not far from Hogans Creek in Caswell County.
In 1820, “Patsey" Blackwell lived in Muhlenberg County, Kentucky, apparently having joined her family after her husband's death. The Muhlenberg census for 1820 showed that she was between 26 and 45 years of age. Two of her sons were under 10 and one son was between 10 and 16. No girls were included in this census, although the Caswell County census of 1800 listed one girl under 10.
William Marshall Blackwell was a son of Levi and Martha “Patsey” Blackwell; born in Caswell County, North Carolina, June 8, 1801; married Elizabeth Strader (or Strador) of Caswell County, August 25, 1818. Elizabeth's parents were Christian and Zepphorah (Summers) Strader. Elizabeth was born in 1799, probably in North Carolina. She died in Kentucky in 1867. William Marshall Blackwell was married a second time, to Mary A. Davis, in Muhlenberg County, Kentucky. He died January 29, 1887, and is buried in the Smith Cemetery, in Smith Township, Posey County, Indiana.
 Some of the information concerning William Marshall Blackwell was furnished by Mrs. H. R. Peck, R. R. 8, Evansville, Indiana. Other information was taken from index to marriages of Muhlenberg County and census records.