18. Leopold II of Belgium
Being the King of Belgium from 1865 to 1909, Leopold II was the person in charge of creating the Congo Free State in the region of Central Africa, and his reasons were, of course, related to material goods that this country had. The main purpose was extracting rubber and ivory, but unfortunately, this could not go without torturing and killing people. Thousands of them were being killed under his rule until the West called Brussels to stop.