Roman Catholic Cardinal. Sezzadio born Luigi Dadaglio entered seminary in Acqui, being ordained priest on May 22, 1937. Serving briefly as coadjutor in Canelli, he moved to the Pontifical Lateran University of Rome, earning a doctorate in utroque iuris in both canon and civil laws on July 6, 1942, and later to the Pontifical Ecclesiastical Academy, pursuing studies in diplomacy between 1941 and 1943. Joining the section of Ordinary Affairs of the Vatican Secretariat of State in 1942, Dadaglio was named secretary of the nunciature in Haiti and the Dominican Republic in 1946, followed by the offices of auditor in the apostolic delegation of the United States in 1950, the apostolic delegation in Canada in 1953 and the apostolic delegation in Australia in 1954. Counselor in the apostolic nunciature in Colombia between 1958 and 1960, he was provisionally in charge of the nunciature in Venezuela in April 1960, following the transfer of the apostolic nuncio, Msgr. Raffaele Forni, to the nunciature of Uruguay, until being named nuncio himself on the following November 18 by Pope John XXIII. Elected archbishop of the titular see of Lero, he received his episcopal consecration on December 8, 1961 inside the church of Ss. Andrea e Gregorio al Monte Celio in Rome from Cardinal Amleto Giovanni Cicognani. Appointed apostolic nuncio in Spain on July 8, 1967, he played a major role in liberalizing the Roman Catholic Church in Spain in the waning years of Francisco Franco's rule. In appreciation towards his prudent and measured stands, King Juan Carlos named him knight grand cross of the Orders of Civil Merit and Charles III. Appointed secretary of the Congregation for Sacraments and Divine Worship on October 4, 1980 and later pro-penitentiary major on April 8, 1984, Pope John Paul II created him cardinal deacon in the consistory of May 25, 1985 with the deaconry of San Pio V a Villa Carpegna, being named major penitentiary of the Apostolic Penitentiary two days later. Appointed archpriest of the Patriarchal Liberian Basilica on December 15, 1986 following the demise of Cardinal Carlo Confalonieri, he was named president of the Central Committee of Marian Year on February 11, 1987. Retiring from the Penitentiary on April 6, 1990, Cardinal Dadaglio died shortly afterward on the following Wednesday, August 22, while hospitalized at Rome's Policlinico Gemelli, where he had been interned for several days due to heart ailment. His remains are found buried inside the cemetery of his native Sezzadio.