The Tsavo Man-Eaters were two Simba Bastet. In March 1898, The British East Africa Company (led by the engineer Lt. Col. John Henry Patterson begans building a railway bridge over the Tsavo River in Uganda. During the construction, two maneless male lions (the lions of Tsavo have sparse manes in general due to the hot, desert conditions) killed many of the workers. They are dubbed the Tsavo Man Eaters. On December 9th, 1898, Engineer Lt. Col. John Henry Patterson killed the first of the two lions, and on December 30, he killed the second Over their reign of terror, the two lions killed nearly 140 workers.
See Wikipedia:Tsavo Man-Eaters for information on the real-life lions.