Pope John XXI (187º): Biography, Pontificate & Legacy

Who Was Pope John XXI?

Pope John XXI — 187º in the Catholic list — reigned 8 September 1276–20 May 1277 during the high Middle Ages. Subject of the Kingdom of Portugal. This Guide Catholic profile gathers background, major acts, and legacy so you can read John XXI beside neighboring pontiffs.

Early Life & Background

Before election he was known as Pedro Julião. Born circa 1215 Lisbon, Kingdom of Portugal, he entered a world shaped by politics and piety very different from today's global Church.

Historical Context

John XXI (#undefined) led during crusades, monastic reform, and cathedral culture — and during sharp contests between popes and emperors over authority in Christendom.

Pontificate & Key Events

The pontificate (8 September 1276–20 May 1277) centered on governance during the high Middle Ages. Due to a confusion over the numbering of popes named John in the 13th century, the ordinal XX was skipped.

Papal Acts & Achievements

Acts associated with John XXI (#187, 8 September 1276–20 May 1277) 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

• 187th pope of the Catholic Church
• Pontificate: 8 September 1276–20 May 1277
• Shepherded the Church during the high Middle Ages
• Successor of St. Peter in the official Catholic list

Legacy in the Catholic Church

John XXI remains pope 187º in the Annuario Pontificio. Set against the high Middle Ages, John XXI's choices show both the limits of any one pontiff and the continuity of the office he held.

Why Catholics Study This Pope Today

If you only remember one modern question about John XXI, ask how his decisions served unity and truth under the pressures of the high Middle Ages. Begin with this documented note: Subject of the Kingdom of Portugal. Use the neighboring pontiff links below to test whether John XXI's reign looks unique or typical for the high Middle Ages.

Place in the Line of Succession

John XXI followed Pope Adrian V (186º, 11 July 1276–18 August 1276) after a transition shaped by the politics and piety of their shared century. He was followed by Pope Nicholas III (188º, 25 November 1277–22 August 1280), 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.