Modern Era · 255th pope in the Annuario Pontificio list
Pius IX
Blessed
- Pontificate
- 16/06/1846 – 07/02/1878
- Birth name
- Giovanni Maria Battista Pietro Pellegrino Isidoro Mastai-Ferretti
- Nationality
- Italy (Papal States)
- Born – died
- 1792 – 1878
- Predecessor
- Gregory XVI
- Successor
- Leo XIII
Historical context
His pontificate also included controversies, such as the Mortara case, still discussed by historians.
Important events
- Defined the Immaculate Conception (1854)
- Convened the First Vatican Council (1869–1870)
- Lost the Papal States; Rome taken in 1870
Councils and documents
- Ineffabilis Deus (1854)
- Syllabus of Errors (1864)
Interesting facts
- The longest pontificate documented with certainty (almost 32 years).
List: Wikidata (CC0), ordinals per the Annuario Pontificio, retrieved 2026-10-01. Antipopes are not included. For the current pope, see vatican.va.