William Riley Duncan 
M, (circa 1859 - 26 September 1903)
- Relationship
- 7th great-grandson of Herman Op Den Graeff
William Riley Duncan was born circa 1859. He was the son of Francis Marion Duncan and Martha Jane Yoakum. William Riley Duncan married Sophronia Ann Stevenson on Saturday, 19 December 1885. William Riley Duncan died on 26 September 1903 at Webb City, Jasper County, Missouri.
Child of William Riley Duncan and Sophronia Ann Stevenson
- Addie Jane Duncan+ (1892 - 1959)
Last Edited=14 Oct 2008