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Khalifa bin Salman Al Khalifa has been the Prime Minister of Bahrain from 1971, hence is the longest-serving prime minister in the world. He still retains his post, although under the 2002 Constitution he has lost some of his power on paper, with the King having the authority to appoint and dismiss ministers. He is the uncle of the reigning King Hamad bin Isa Al Khalifa. (via Freebase)