Pius IX

(A.D. 1792–1878) Also known by the Italian form of his name, “Pio Nono,” popeThe Roman Catholic bishop of Rome who is regarded as the successor of the chief apostle, Peter, and as the Vicar of Christ is the holder of the Aposto... more from 1846–1878, the longest reigning popeThe Roman Catholic bishop of Rome who is regarded as the successor of the chief apostle, Peter, and as the Vicar of Christ is the holder of the Aposto... more in history, who defined the doctrineis derived from the Latin word for teaching, doctrina, and is an important aspect of Christianity more so than other world religions because Christian... more of the Immaculate ConceptionA Roman Catholic tradition that that the Virgin Mary was conceived without original sin. This doctrine was formally accepted by Pope Pius IX in A.D. 1... more in 1854, promulgated the Syllabus of Errors(A.D. 1864) Pope Pius IX publishes the Syllabus of Errors, which denounce many modern beliefs such as freedom of religion. more in 1864, and presided over the First VaticanAn independent city-state within the broader city of Rome. Vatican City is ruled by the Pope, the Catholic Bishop of Rome and head of the Catholic Chu... more Council, which defined the doctrineis derived from the Latin word for teaching, doctrina, and is an important aspect of Christianity more so than other world religions because Christian... more of papal infallibility in 1870.