Pope John — history, numbering, and notable holders of the name

Numbering and irregularities

The sequence of pontifical numerals for John contains unusual features. Medieval catalogues and transcription mistakes caused confusing or skipped numbers; for example, there is no universally recognized Pope John XX in the formal list of legitimate popes despite the existence of later numbers such as John XXI and John XXII. In addition, rival claimants to the papacy (antipopes) have at times used the name John and the same numerals, which further complicates the historical record. Antipopes bearing the name John are treated separately from the legitimate line of popes.

Notable Popes named John

• Pope John I (early 6th century) — an early medieval pope whose pontificate falls shortly after the fall of the Western Roman Empire.
• Pope John VII (early 8th century) — known from the Byzantine-influenced period of Rome and surviving liturgical and artistic traces.
• Pope John IX (late 9th century) — one of several Johns active during the turbulent politics of early medieval Italy.
• Pope John XV (late 10th century) — served during a time when the papacy was closely entangled with Roman noble families.
• Pope John XIX (11th century) — an example of a medieval pope whose reign belongs to a period of reform and shifting power relationships.
• Pope John XXIII (1958–1963) — the 20th-century pope who convoked the Second Vatican Council, an event that had major consequences for modern Catholic practice and ecumenical relations.

History and development

The name John appears among the earliest lists of Roman bishops. Over time, as church administration and record-keeping evolved, the occurrence of multiple Johns and the involvement of secular rulers in papal elections produced a complex sequence of reigns. The Middle Ages especially produced overlapping claims and local chroniclers who used incompatible numbering systems. Later historians and the Vatican itself have worked to clarify the canonical list, distinguishing legitimate pontiffs from antipopes and correcting earlier numerical mistakes when possible.

Importance and distinctions

Popes named John played varied roles: some were administrators and lawgivers, others patrons of art and liturgy, and some acted decisively in moments of doctrinal or institutional reform. The modern Pope John XXIII is widely remembered for initiating the Second Vatican Council (1962–1965), which sought to address the Church's relationship with the modern world and to update many aspects of Catholic worship and governance. When consulting historical accounts, it is important to note whether a text refers to a legitimate pope or an antipope and to check dates and numerals carefully.

Further reading and related entries

For lists and individual biographies of each Pope John, consult specialized ecclesiastical histories and official Vatican catalogues. When following links or bibliographies, be aware that the same regnal name appears many times and that an attached numeral is essential to identify the person correctly. See also entries on antipopes named John and on the regnal naming practices of the papacy for broader context.