Pope Alexander III (170º): Biography, Pontificate & Legacy
Pontificate: 7 September 1159–30 August 1181
Alexander III was the 170th pope of the Catholic Church, reigning 7 September 1159–30 August 1181 during the high Middle Ages. Subject of the March of Tuscany.
Who Was Pope Alexander III?
This biography of Alexander III (170º) 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 Rolando Bandinelli. Born circa 1100 Siena, March of Tuscany, he entered a world shaped by politics and piety very different from today's global Church.
Historical Context
Alexander III 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 Third Council of the Lateran(1179).
Pontificate & Key Events
The pontificate (7 September 1159–30 August 1181) centered on governance during the high Middle Ages.
Papal Acts & Achievements
Alexander III 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
- 170th pope of the Catholic Church
- Pontificate: 7 September 1159–30 August 1181
- Convened the Third Council of the Lateran(1179).
- Shepherded the Church during the high Middle Ages
- Successor of St. Peter in the official Catholic list
Legacy in the Catholic Church
Alexander III remains pope 170º 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 Alexander III 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
Alexander III followed Pope Adrian IV (169º) in the unbroken line of apostolic succession from St. Peter. Upon his death or resignation, he was succeeded by Pope Lucius III (171º), 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.