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Mao Tse-Tung was a Chairman of China in the 20th century. During the preparations for the World Peace Conference, the Third Doctor mentioned to the Chinese delegate Fu Peng that he remembered having a conversation in Hokkien with Mao, at which time the Chairman allowed the Doctor to call him "Tse-Tung". (TV: The Mind of Evil)
Behind the scenes
The fact that the Doctor suggests he spoke Hokkien with Mao suggests a difference between the real world and the DWU. In real life, Mao did not speak Hokkien, as he came from deep within rural Hunan Province, far away from the reach of Hokkien.