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Pope Pius IX promulgates the encyclical Quanta cura and its appendix, the Syllabus of Errors, outlining the authority of the Catholic Church and condemning various liberal ideas.

Historical image related to Pope Pius IX promulgates the encyclical Quanta cura and its appendix, the Syllabus of Errors, outlining the authority of the Catholic Church and condemning various liberal ideas. from December 8, 1864

Pope Pius IX

Head of the Catholic Church from 1846 to 1878

Pope Pius IX was head of the Catholic Church from 1846 to 1878. His reign of nearly 32 years is the longest verified of any pope in history; if including unverified reigns, his reign was second to that of Peter the Apostle. He was notable for convoking the First Vatican Council…
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Quanta cura

1864 papal encyclical issued by Pope Pius IX

Quanta cura was a papal encyclical issued by Pope Pius IX on 8 December 1864. In it, he decried what he considered significant errors afflicting the modern age. These he listed in an attachment called the Syllabus of Errors, which condemned secularism and religious…
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Syllabus of Errors

1864 document issued by the Holy See

The Syllabus of Errors is the name given to an index document issued by the Holy See under Pope Pius IX on 8 December 1864 at the same time as his encyclical letter Quanta cura. It collected a total of 80 propositions that the Pope considered to be current errors or heresies,…
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Catholic Church

Christian church based in Rome

The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institutions and has played a prominent role in the history…
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Liberalism

Political ideology based on individual rights and liberty

Liberalism is a political and moral philosophy based on the rights of the individual, liberty, consent of the governed, political equality, the right to private property, and equality before the law. Liberals espouse various and sometimes conflicting views depending on their…
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