Prince Khalifa bin Salman Al Khalifa is a Bahraini royal and politician who has served as the Prime Minister of Bahrain since 1970, taking office over a year before Bahrain's independence on 15 August 1971. He is the longest-serving current Prime Minister of any government in the world. He still retains a great amount of power, although under the 2002 Constitution he lost some of his powers, with the King having the authority to appoint and (along with the Bahraini parliament) dismiss ministers. He is the paternal uncle of the reigning King Hamad bin Isa Al Khalifa and granduncle of the Crown Prince Salman, since he is the younger brother of the former Emir Isa bin Salman Al Khalifa.

Source: Wikipedia - Khalifa bin Salman Al Khalifa