Who had his heart buried in Africa and his body buried in Westminster Abbey almost a year later?

The account of the Hearings before the United States Commission on CIVIL RIGHTS Vol. 1 - Voting, held in February 16-20,1965 in Jackson Mississippi

“Employment of Laborers of African Extraction in the Island of St. Croix”, 37th Congress. June 6, 1862

Hon. John P. Hale (NH) "The Wrongs of Kansas", given Feb. 26, 1856