Ngô Đình Diệm (] ; 3 January 1901 – 2 November 1963) was a South Vietnamese politician. A former mandarin of the Nguyễn dynasty, he was named Prime Minister of the State of Vietnam by Head of State Bảo Đại in 1954. In October 1955, after winning a heavily rigged referendum, he deposed Bảo Đại and established the first Republic of Vietnam (RVN), with himself as president. He was a leader of the Catholic element and was opposed by Buddhists