From NKAA, Notable Kentucky African Americans Database (main entry)
Henderson, Erskine
(born: 1864 - died: 1913)Erskine Henderson is the only jockey to win three derbies in one year: the Kentucky Derby, Tennessee Derby, and Coney Island (New York) Derby, all in 1885 aboard Joe Cotton.
For more see p. 114 of SCLC: The Southern Leadership Conference National Magazine, vol. 23, issue 4 (Aug-Oct, 1994); and Erskine Henderson in Horse Racing's Most Wanted, by D. L. Hudson, Jr.
*Additional information provided by Yvonne Giles, "The register wrote his name as "Earthshins Henison" with a death date of 25 Nov 1913, burial in Versailles, KY certificate #30819."