Helen Pitts Douglass was an American abolitionist and suffragette. She was the second wife of Frederick Douglass.
They were married by Rev. Francis Grimke at the Washington 15th Street Presbyterian Church. Frederick was 66 and Helen was 46 at the time of their marriage. Neither Douglass' children nor Helen's family approved of the marriage. 
"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MCBY-LXT : accessed 27 Jul 2014), Helen Pitts in household of Gideon Pitts, Richmond, Ontario, New York, United States; citing family 215, NARA microfilm publication M432.
"District of Columbia Marriages, 1811-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK9B-PQYL : 11 February 2018), Frederick Douglass and Helen Pitts, 24 Jan 1884; citing p. 7145, Records Office, Washington D.C.; FHL microfilm 2,025,890.
"District of Columbia Deaths, 1874-1961," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F7YH-JMN : accessed 15 February 2020), Helen Pitts Douglass, 01 Dec 1903, District of Columbia, United States; citing reference ID 151.895, District Records Center, Washington D.C.; FHL microfilm 2,115,158.