Background
Born in Osijek, in the Austro-Hungarian Kingdom of Croatia-Slavonia (present-day Croatia), he and his family moved to Zagreb in 1910. His father was a tailor and his mother a seamstress.
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Born in Osijek, in the Austro-Hungarian Kingdom of Croatia-Slavonia (present-day Croatia), he and his family moved to Zagreb in 1910. His father was a tailor and his mother a seamstress.
He served as Prefect of the Congregation for the Doctrine of the Faith from 1968-1981, and was elevated to the cardinalate in 1965. Studying in Zagreb and Rome (including the Pontifical Gregorian University), Šeper was ordained to the priesthood by Archbishop Giuseppe Palica on 26 October 1930. He did pastoral work in the Archdiocese of Zagreb and, in 1934, was appointed private secretary to the Archbishop.
In 1941 Father Šeper became the rector of the archdiocesan seminary, a post which he held for the next decade.
On 22 July 1954 he was named Coadjutor and Titular Archbishop of Philippopolis. He received his episcopal consecration on the following 21 September from Archbishop Josip Ujčić of Belgrade.
He succeeded Aloysius Stepinac as on 5 March 1960, and was created -Priest of Ss. Pietro e Paolo a Via Ostiense by Pope Paul VI in the consistory of 22 February 1965.
He resigned as on 20 August 1969.
He had advocated religious liberty and the introduction of the vernacular into the liturgy during the Second Vatican Council. During his visit to the United States in 1966, he received an honorary doctorate from Villanova University. He was named Prefect of the Congregation for the Doctrine of the Faith on 8 January 1968.
Šeper was the author of the document Mysterium Ecclesiae, which was written in order to re-orient the ecclesiology of the post-Vatican II period.
Šeper was also the President of the International Theological Commission from its inception in April 1969. In 1974, the Congregation published a "declaration on procured abortion", re-asserting the Church"s opposition to the controversial procedure since the publication of Humanae Vitae.
lieutenant later published the document Persona Humana on the topic of sexual ethics. In 1980, he also wrote the CDF"s declaration on Euthanasia, explaining the Church"s view on ending life.
He was a cardinal elector in the August and October conclaves of 1978.
Šeper retired as Prefect on 25 November 1981 and died a month later, on the morning of 30 December, at 76 from a myocardial infarction in Gemelli Hospital. Pope John Paul II presided over his funeral Mass, and the cardinal"s body was later transferred to Zagreb, where it is buried beside the tomb of Stepinac. On the 25th anniversary of his death (30 December 2006), William Levada, the holder at that time of Šeper"s former curial position (Prefect of the Doctrine of the Faith), celebrated a Requiem Mass for him at the Zagreb cathedral.