About Leopold II of Belgium
Leopold II was the second king of the Belgians from 1865 to 1909, and the founder and sole owner of the Congo Free State from 1885 to 1908. In one of the first uses of the term, George Washington Williams described the practices of Leopold's administration of the Congo Free State as "crimes against humanity" in 1890. Leopold's sister Charlotte became Empress Carlota of Mexico in 1864. Leopold's public career began on his attaining the age of majority in 1855, when he became a member of the Belgian Senate.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.