Mao Zedong

Mao Tse-Tung was the communist leader of China from 1949 to his death in 1976. The Third Doctor mentioned to a Chinese delegate that in 1936 one of his earlier incarnations joined Mao Tse-Tung on the Long March — during which Mao allowed the Doctor to call him Tse-Tung. (TV: The Mind of Evil)