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 Russia Minister. In case of the President's death, resignation or impeachment, the Prime Minister becomes a temporary president until new presidential elections which must take place within three months. The Prime Minister as Acting President may not dissolve the State Duma, announce a referendum or propose amendments to the Constitution. The Chairman of the Federation Council is the third important position after the President and the Prime Minister. In the case of incapacity of the President and Prime Minister, the chairman of the upper house of parliament becomes acting head of state. As of , there are seven living former Prime