Sarit Thanarat was a Thai politician and military commander. He served as commander-in-chief of the Royal Thai Army and as Minister of Defense during Plaek Phibunsongkhram's premiership. In 1957, he became chief of a military junta after leading a coup in which Phibun was overthrown. Sarit lasted the de facto prime minister only five days before was replaced by Pote Sarasin, but assumed power again as the head of the Revolutionary Council after 1958 coup and then as the eleventh Prime Minister of Thailand in February 1959 until his death in 1963.