Blessed Pius IX Papacy began 16 June 1846 Papacy ended 7 February 1878 Predecessor Gregory XVI Successor Leo XIII Orders Ordination 10 April 1819 Consecration 3 June 1827 by Pope Pius VIII Created Cardinal 14 December 1840 Personal details Birth name Giovanni Maria Mastai-Ferretti Born 13 May 1792 Senigallia, Papal States Died 7 February 1878 (aged 85) Apostolic Palace, Rome, Italy
Blessed Pope Pius IX was the longest-reigning elected Pope in the history of the Catholic Church. During his pontificate, he convened the First Vatican Council, which decreed papal infallibility. The Pope defined the dogma of the Immaculate Conception of the Blessed Virgin Mary. In addition to this, Pius IX was also the last Pope to rule as the Sovereign of the Papal States, which fell completely to Italian nationalist armies and were incorporated into the Kingdom of Italy.