Short-lived copper-and-ivory kingdom of Msiri in Katanga, ended by the Congo Free State.
The Yeke Kingdom ended on 20 December 1891 when Belgian officer Omer Bodson shot and killed King Msiri at Bunkeya during the Stairs Expedition, after which the Congo Free State claimed Katanga.
Msiri's copper-ivory-and-slave Katangan state in its trading context (broad, not Yeke-specific).
Central Africa and the Congo basin's history (broad continental context).