Karl Denke (11 February 1860 – 22 December 1924) was a German serial killer and cannibal who killed and cannibalized dozens of homeless vagrants and travellers from 1903 to 1924. He has been nicknamed the Cannibal of Münsterberg and the Forgotten Cannibal.

Mark James Robert Essex (August 12, 1949 – January 7, 1973) was an American serial sniper and black nationalist known as the "New Orleans Sniper" who killed a total of nine people, including five police officers, and wounded twelve others, in two separate attacks in New Orleans on December 31, 1972, and January 7, 1973. Essex was killed by police in the second armed confrontation.

Muhammad Ahmad bin Abdullah bin Fahal (Arabic: محمد أحمد بن عبد الله بن فحل; 12 August 1843 – 21 June 1885) was a Sudanese religious and political leader. In 1881, he claimed to be the Mahdi and led a war against Egyptian rule in Sudan, which culminated in a remarkable victory over them in the Siege of Khartoum.