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First Vatican Council: papal infallibility
1869–1870· Council, creed or writing· Church, doctrine & the world
Historical recordConfirmed by archaeology, outside sources or contemporary records.
Catholic council of 1869–1870 that defined papal infallibility and the pope's supreme authority over the whole Church.
See it on the Bible & Christianity map →What it is
Pope Pius IX gathered about 700 bishops in St. Peter's. On July 18, 1870, the constitution Pastor Aeternus passed 533 to 2: when the pope speaks ex cathedra ('from the chair' of Peter, that is, formally) on faith or morals, he is protected from error. It also affirmed his direct authority over every diocese. About 60 opposing bishops left Rome before the vote. The next day the Franco-Prussian War began; Italian troops took Rome in September, and the council was suspended.
Why it matters
It capped the papacy's centralizing power just as it lost its lands. Infallibility has been formally invoked only once since, for Mary's Assumption (1950).
Sources and history
The council's acts and voting records were published in full, and bishops' diaries and letters record the fierce debates inside and outside the hall.
Questions and debates
Orthodox and Protestants reject the dogma, and Catholics debate which past teachings count as infallible. Some German-speaking Catholics broke away over it, forming the Old Catholic Church.
Inside this (1)
Connections (2)
▸First Vatican Council: papal infallibility declared the infallibility of The papacy: the popes and medieval ChristendomHistorical record
The connection
Vatican I capped centuries of growing papal authority by defining two things: the pope's full, direct jurisdiction over every diocese, and his infallibility when he speaks ex cathedra on faith and morals. It came just as the popes lost the Papal States to Italy, trading earthly power for spiritual authority.
When and where
St. Peter's Basilica, Rome; the decree Pastor Aeternus passed on July 18, 1870, under Pope Pius IX, who had called the council.
Historical evidence
The decree's text and the 533–2 final vote are recorded in the council's acts; diaries record the opposition, led by German, Austrian and French bishops.
Questions and debates
How the dogma fits with bishops' authority was left unfinished when the council was cut short; Vatican II (1964) added a balancing teaching on bishops' shared, 'collegial' authority.
▸First Vatican Council: papal infallibility was completed and balanced by Second Vatican CouncilHistorical record
The connection
Vatican I defined papal primacy and infallibility in 1870 but broke off when Italian troops took Rome, leaving its planned teaching on bishops unfinished. Vatican II took that up: Lumen Gentium (1964) reaffirmed Vatican I but taught 'collegiality,' that the bishops together with the pope share responsibility for the whole church.
When and where
St. Peter's Basilica: Vatican I from December 1869 until its suspension in October 1870; Vatican II, 1962–65, with Lumen Gentium approved November 21, 1964.
Historical evidence
Lumen Gentium 18 says the council follows 'in the footsteps of the First Vatican Council'; both councils' documents and debates are published.
Questions and debates
How collegiality fits with papal primacy is still argued; Paul VI added an explanatory note in 1964 to reassure worried bishops. Orthodox and Protestants reject infallibility.