Written by Guide Catholic
Pope St. Sixtus III (44º): Biography, Pontificate & Legacy
Pontificate: 31 July 432 –18 August 440 · Origin: Rome, Italy, Roman Empire · Birth name: Xystus Tertius
St. Sixtus III was the 44th pope of the Catholic Church, reigning 31 July 432 –18 August 440 during the apostolic and patristic Church. The Catholic Church venerates him as a saint.
Who Was Pope Sixtus III?
Pope Sixtus III — 44º in the Catholic list — reigned 31 July 432 –18 August 440 during the apostolic and patristic Church. This Guide Catholic profile gathers background, major acts, and legacy so you can read Sixtus III beside neighboring pontiffs. Catholics also honor him as a saint whose intercession remains part of living devotion.
Early Life & Background
Born Rome, Italy, Roman Empire, he entered a world shaped by politics and piety very different from today's global Church.
Historical Context
Sixtus III (#undefined) shepherded Christians when the faith was still illegal or barely tolerated inside the Roman Empire; records are thin, yet tradition preserves these earliest successors of St. Peter.
Pontificate & Key Events
The pontificate (31 July 432 –18 August 440) centered on governance during the apostolic and patristic Church. Sources include apostolic tradition and the Liber Pontificalis.
Papal Acts & Achievements
Acts associated with Sixtus III (#44, 31 July 432 –18 August 440) still draw historians and Catholics who want more than a one-line summary. His reign remains a link in the succession now counted at 267 popes.
Key Highlights
- 44th pope of the Catholic Church
- Pontificate: 31 July 432 –18 August 440
- Venerated as a saint in the Catholic Church
- Shepherded the Church during the apostolic and patristic Church
- Successor of St. Peter in the official Catholic list
Legacy in the Catholic Church
St. Sixtus III remains pope 44º in the Annuario Pontificio. The Church still points to Sixtus III's virtues for imitation. Set against the apostolic and patristic Church, Sixtus III's choices show both the limits of any one pontiff and the continuity of the office he held.
Why Catholics Study This Pope Today
Place Sixtus III on your mental map: 44º successor of Peter, reigning 31 July 432 –18 August 440, formed by the apostolic and patristic Church. Because the Church venerates Sixtus III, you may seek his intercession and check his feast in the Martyrology or local calendar. Then step back to the full list of 267 popes to see where Sixtus III sits between crisis and consolidation.
Place in the Line of Succession
St. Sixtus III followed Pope St. Celestine I (43º, 10 September 422 –27 July 432) after a transition shaped by the politics and piety of their shared century. He was followed by Pope St. Leo I the Great (45º, 29 September 440 –10 November 461), whose biography continues the chain on Guide Catholic. For the full chronological map, see our complete list of all 267 popes — then read neighboring biographies for contrast, not only continuity.