William Henry Sheppard was one of the earliest African Americans to become a missionary for the Presbyterian Church. He spent 20 years in Africa, primarily in and around the Congo Free State, and is best known for his efforts to publicize the atrocities committed against the Kuba and other Congolese peoples by King Leopold II's Force Publique.

The Kuba Kingdom, also known as the Kingdom of the Bakuba or Bushongo, is a traditional kingdom in Central Africa. The Kuba Kingdom flourished between the 17th and 19th centuries in the region bordered by the Sankuru, Lulua, and Kasai rivers in the heart of the modern-day Democratic Republic of the Congo.