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HISTORY of Christian Theology

(A.D. 1792–1878) Also known by the Italian form of his name, “Pio Nono,” pope from 1846–1878, the longest reigning pope in history, who defined the doctrine of the Immaculate Conception in 1854, promulgated the Syllabus of Errors in 1864, and presided over the First Vatican Council, which defined the doctrine of papal infallibility in 1870.

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PEOPLE (see A.D. 1792–1878)
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