Background and career
Pierre Martin Ngô Đình Thục (Vietnamese pronunciation: [ŋo ɗîŋ̟ tʰùk]) (6 October 1897 – 13 December 1984) was a Vietnamese Catholic prelate who served as the first Archbishop of Huế in the Republic of Vietnam from 1960 until 1968. He later lived in exile in Europe due to the unrest in his country and became a sedevacantist, consequently excommunicated twice by the Catholic Church. Five months before he died, he repented his views and was reconciled to the church.
He was a member of the Ngô family who ruled South Vietnam before and during the early years of the Vietnam War and was the founder of Dalat University. While Thục was in Rome attending the second session of the Second Vatican Council, the 1963 South Vietnamese coup overthrew and assassinated his younger brothers, Ngô Đình Diệm (who was president of South Vietnam) and Ngô Đình Nhu. Thục was unable to return to Vietnam and lived the rest of his life exiled in Italy, France, and the United States. During his exile, he was involved with Traditionalist Catholic movements and consecrated a number of bishops without the Vatican's approval for the Palmarian and sedevacantist groups. Today, various Independent Catholic and sedevacantist groups claim to have derived their apostolic succession from Thục.

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