Pope Bl. Gregory X (184º): Biography, Pontificate & Legacy
Pontificate: 1 September 1271–10 January 1276
Bl. Gregory X was the 184th pope of the Catholic Church, reigning 1 September 1271–10 January 1276 during the high Middle Ages. Citizen of the Free Commune of Piacenza.
Who Was Pope Bl. Gregory X?
This biography of Bl. Gregory X (184º) covers background, major events, and legacy in the line of St. Peter. During the high Middle Ages, the Bishop of Rome exercised teaching, sanctifying, and governing authority for the universal Church.
Early Life & Background
Before election he was known as Teobaldo Visconti. Born circa 1210 Free Commune of Piacenza(city-state), he entered a world shaped by politics and piety very different from today's global Church.
Historical Context
Bl. Gregory X led the Church in the high Middle Ages — an era of crusades, monastic reform, cathedral building, and intense negotiation between popes and emperors over who held ultimate authority in Christendom. Convened the Second Council of Lyon and issued the bull Ubi periculum(1274), regulating conclaves until the 20th century.
Pontificate & Key Events
The pontificate (1 September 1271–10 January 1276) centered on governance during the high Middle Ages.
Papal Acts & Achievements
Bl. Gregory X left a distinct mark through decisions that historians still debate and Catholics still study. His reign contributed to the continuous apostolic succession now numbering 267 popes.
Key Highlights
- 184th pope of the Catholic Church
- Pontificate: 1 September 1271–10 January 1276
- Beatified by the Catholic Church
- Convened the Second Council of Lyon and issued the bull Ubi periculum(1274), regulating conclaves until the 20th century.
Legacy in the Catholic Church
Bl. Gregory X remains pope 184º in the Annuario Pontificio. Read against the high Middle Ages, his pontificate shows how Providence works through imperfect ministers without abandoning the Barque of Peter.
Why Catholics Study This Pope Today
Studying Bl. Gregory X helps Catholics see how the Holy Spirit guided the Church through the high Middle Ages — with human weakness and grace intertwined. Primary sources from this pontificate — bulls, conciliar acts, or encyclicals — reward readers who want depth beyond summaries. Place this pope in context using our chronological list of all 267 popes and the biographies of his immediate predecessor and successor linked below.
Place in the Line of Succession
Bl. Gregory X followed Pope Clement IV (183º) in the unbroken line of apostolic succession from St. Peter. Upon his death or resignation, he was succeeded by Pope Bl. Innocent V (185º), who continued the mission of shepherding the universal Church. Explore the full chronological chain in our complete list of all 267 popes, or read the biographies of neighboring pontiffs linked below.