Prime Minister of Thailand Rajanubhab took over this role. In fact, the office most considered the precursor of that of the prime minister was the ancient office of "Samuha Nayok" (สมุหนายก), which was run by an "Akkhra Maha Senabodi" (อัครมหาเสนาบดี) or "chief minister in charge of civilian affairs". The first Prime Minister of Siam was Phraya Manopakorn Nititada, a judge. The title of the office was changed from "Prime Minister "of Siam"" to "Prime Minister "of Thailand"" in 1945 and then permanently with the renaming of Siam to Thailand in 1949. For most of its existence the office has been occupied by Army leaders;
Prime Minister of Vietnam Council of Ministers, the highest executive body of state, from 1981 until it was renamed to Government in the 1992 constitution. The office of prime minister was renamed in the 1980 constitution to that of Chairman of the Council of Ministers. Pham Van Dong, the second Prime Minister of Vietnam, served as North Vietnamese Prime Minister from 1955 until 1976, when he became prime minister of a unified Vietnam, and then until 1987, when he resigned. At his resignation, he was the longest-serving prime minister in Vietnamese history, and the oldest serving prime minister in the world. He often lamented