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Named assistant librarian of the Vatican Library in 1919 and Monsignor in 1921, Tisserant became Pro-Prefect of the Vatican Library on 15 November 1930 and was named a protonotary apostolic on 13 January 1936.
Tisserant held a number of offices in the Roman Curia. He served as secretary of the Congregation for the Oriental Churches (1936–1959), as president of the Pontifical Biblical Commission (1938–1946) and as Prefect of the Congregation of Ceremonies (1951–1967). From 1957 to 1971, he served as Librarian and Archivist of the Holy Roman Church. Under Pius XII, Tisserant also headed a commission to investigate alleged abuses of appointments in the Order of Malta, which concluded that there was no wrongdoing.[3]
In 1939, Tisserant urged Pius XII to promulgate an encyclical "on the duty of Catholics to resist the unjust orders of an authoritarian state."[4] After the outbreak of World War II, Pius XII refused to release Tisserant as the head of the Vatican Library, preventing him from returning to France to serve in the army.[3]
In 1946, Tisserant was elevated to the rank of Cardinal Bishop by Pope Pius, taking the title of Porto e Santa Rufina in 1946. After serving as vice-dean of the College of Cardinals from 1947 to 1951, he became dean and Cardinal Bishop of Ostia on 13 January 1951. As dean of the Sacred College, he presided at the Funeral Masses of Popes Pius XII and John XXIII and presided over the conclaves to elect their successors in 1958 and 1963. During the 1958 conclave, he was seen as papabile by most Vatican-watchers, and it is generally believed that he received at least five votes in the early balloting.[5] In 1956, Tisserant received an honorary doctorate from Coimbra University, and in 1961, he was elected a member of the Académie Française.
Second Vatican Council and beyond
From 1962 to 1965, Tisserant attended the Second Vatican Council and sat on its Board of Presidency. As Dean of the College of Cardinals, he was the celebrant of the Mass coram Summo Pontifice at the opening ceremony of the council, before the Pope delivered the council's opening address and the other rites specific to the opening of a general council were performed.
He is said to have participated in negotiating a secret 1960s agreement between Soviet and Vatican officials that authorised Eastern Orthodox participation in the Second Vatican Council in exchange for a noncondemnation of atheistic communism during the conciliar assemblies.[6][7] As Dean of the Sacred College, he was the first person after Pope Paul VI to sign each of the acts of the Second Vatican Council.
In 1962, Tisserant became Grand Master of the Order of the Holy Sepulchre, a position that he held until his death. In 1969, he demanded a retraction from Cardinal Leo Joseph Suenens, Archbishop of Brussels-Mechelen, for the "defamatory and slanderous" statements that he allegedly made against the bureaucracy of the Roman Curia.[5] In 1970, when Paul VI's new retirement rules restricted the right to vote in papal conclaves to cardinals under age 80, Tisserant, then 86, objected on the basis that each cardinal's health should determine his fitness and suggested that 73-year-old Paul VI seemed frail.[8]