Pope John (numbering)
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The numbering of Popes John
Pope John
Pope John has been the most common papal name in the Roman Catholic Church, used by 21 popes, though the numbering of them has been irregular through history owing to antipopes and differences in old lists...

do not occur in strict numerical order. These discrepancies are due in part to a now discounted belief in another Pope John between John XIV and John XV, and the antipapacy of John XVI.
John Dates of Papacy Notes #
There is no controversy regarding the numbering of the popes John before XV

I
Pope John I
Pope Saint John I was Pope from 523 to 526. He was a native of Siena or the Castello di Serena, near Chiusdino. He is the first pope known to have visited Constantinople while in office....

  II
Pope John II
Pope John II was pope from 533 to 535.He was the son of a certain Projectus, born in Rome and a priest of the Basilica di San Clemente on the Caelian Hill. He was made pope January 2, 533. The basilica of St. Clement still retains several memorials of "Johannes surnamed Mercurius"...

  III
Pope John III
Pope John III was pope from 561 to July 13, 574. He was born in Rome, of a distinguished family. The Liber Pontificalis calls him a son of one Anastasius. His father bore the title of illustris, more than likely being a vir illustris...

  IV
Pope John IV
Pope John IV was elected Pope of the Catholic Church, after a four-month sede vacante, December 24, 640.Pope John was a native of Dalmatia . He was the son of the scholasticus Venantius. At the time of his election he was archdeacon of the Roman Church, an important role in governing the see...

  V
Pope John V
Pope John V was pope from July 685 to August 2, 686. John V was the first pope of the Byzantine Papacy allowed to be consecrated by the Byzantine emperor without prior consent, and the first in a line of ten consecutive popes of eastern origin...

  VI
Pope John VI
Pope John VI was a Greek pope from Ephesus who reigned during the Byzantine Papacy from October 30, 701 to January 11, 705. His papacy was noted for military and political breakthroughs on the Italian peninsula. He succeeded to the papal chair two months after the death of Pope Sergius I, and his...

  VII
Pope John VII
Pope John VII was pope from 705 to 707. The successor of John VI, he was of Greek ancestry. He is one of the popes of the Byzantine captivity.-Biography:...

  Anti-VIII
Antipope John VIII
Antipope John VIII or Antipope John was an Antipope of the Roman Catholic Church, during the year of 844. On the death of Pope Gregory IV, the Archdeacon John was proclaimed Pope by popular acclamation, while the nobility elected Pope Sergius II, a Roman of noble birth. The opposition was...

  VIII
Pope John VIII
Pope John VIII was pope from December 13, 872 to December 16, 882. He is often considered one of the ablest pontiffs of the ninth century and the last bright spot on the papacy until Leo IX two centuries later....

  IX
Pope John IX
-Early life:Little is known about John IX before he became Pope. Born in Tivoli in an unknown year, he was ordained as a Benedictine priest by Pope Formosus...

  X
Pope John X
Pope John X, Pope from March 914 to May 928, was deacon at Bologna when he attracted the attention of Theodora, the wife of Theophylact, Count of Tusculum, the most powerful noble in Rome, through whose influence he was elevated first to the see of Bologna and then to the archbishopric of...

  XI
Pope John XI
Pope John XI was a Pope from March 931 to December 935.-Parentage:The parentage of John XI is still a matter of dispute. According to Liutprand of Cremona and the "Liber Pontificalis," he was the natural son of Pope Sergius III , Pope John XI (910? – December 935) was a Pope from March 931 (at...

  XII
Pope John XII
Pope John XII , born Octavianus, was Pope from December 16, 955, to May 14, 964. The son of Alberic II, Patrician of Rome , and his stepsister Alda of Vienne, he was a seventh generation descendant of Charlemagne on his mother's side.Before his death, Alberic administered an oath to the Roman...

  XIII
Pope John XIII
Pope John XIII of Crescenzi family served as Pope from October 1, 965, until his death.Born in Rome, he spent his career in the papal court...

Pope John XIV
Pope John XIV
Pope John XIV was Pope from December, 983 to August 20, 984, successor to Pope Benedict VII He was born at Pavia, and before his elevation to the papal chair was imperial chancellor of Emperor Otto II , and was the latter's second choice.His original name was Pietro Canepanova, but he took the...

983–984 Pietro Canepanova 14
John Medieval historians misreading the Liber Pontificalis assumed another Pope John between Pope John XIV
Pope John XIV
Pope John XIV was Pope from December, 983 to August 20, 984, successor to Pope Benedict VII He was born at Pavia, and before his elevation to the papal chair was imperial chancellor of Emperor Otto II , and was the latter's second choice.His original name was Pietro Canepanova, but he took the...

 and the true Pope John XV
Pope John XV
Pope John XV , Pope from 985 to 996, succeeding Boniface VII . He was said to have been Pope after another Pope John that reigned four months after Pope John XIV and was named "Papa Ioannes XIV Bis" or "Pope John XIVb"...

, mistaking him with the historical character of cardinal deacon John son of Robert, that opposed to Antipope Boniface VII
Antipope Boniface VII
Antipope Boniface VII , was an antipope . He is supposed to have put Pope Benedict VI to death. A popular tumult compelled him to flee to Constantinople in 974; he carried off a vast treasure, and returned in 984 and removed Pope John XIV from office, who had been elected in his absence, by murder...

.
Pope John XV
Pope John XV
Pope John XV , Pope from 985 to 996, succeeding Boniface VII . He was said to have been Pope after another Pope John that reigned four months after Pope John XIV and was named "Papa Ioannes XIV Bis" or "Pope John XIVb"...

985–996 John Sometimes called XVI because of legendary predecessor, born to confusion between the reign of Boniface VII, the four month-long imprisonment of John XIV signed as a distinct pontificate in the Liber Pontificalis and the historical cardinal deacon John son of Robert that opposed to Boniface VII after death of John XIV 15
Antipope John XVI
Antipope John XVI
John XVI , born , , was an antipope from 997 to 998.-Life:He was born of Greek descent and was a native of Rossano in Calabria, southern Italy. At the time the region was a territory of the Byzantine Empire and John was the chaplain of Theophanu, the Empress consort of Emperor Otto II , who had...

997–998 Johannes Philagathos or Piligato or Filagatto An antipope
Antipope
An antipope is a person who opposes a legitimately elected or sitting Pope and makes a significantly accepted competing claim to be the Pope, the Bishop of Rome and leader of the Roman Catholic Church. At times between the 3rd and mid-15th century, antipopes were typically those supported by a...

, according to conventional wisdom, and thus his regnal number XVI should have been reused. This occurred, but some centuries later the sequencing was wrongly "corrected" by some medieval historians and it has never been corrected again. He was elected in opposition to Pope Gregory V
Pope Gregory V
Pope Gregory V, né Bruno of Carinthia , Pope from May 3, 996 to February 18, 999, son of the Salian Otto I, Duke of Carinthia, who was a grandson of the Emperor Otto I the Great . Gregory V succeeded Pope John XV , when only twenty-four years of age...

 (996
996
Year 996 was a leap year starting on Wednesday of the Julian calendar.- Europe :* March or April – Pope John XV dies before being able to crown Otto III, King of Germany as Holy Roman Emperor...

999
999
Year 999 was a common year starting on Sunday of the Julian calendar.- Europe :* Silesia is incorporated into territory ruled by Boleslaus I of Poland.* The Orsay commune is founded.- Asia :...

).
Pope John XVII
Pope John XVII
Pope John XVII , born John Sicco, and the son of another John Sicco, was born in the region of Rome then referred to as Biveretica...

1003 Sicco Took the number XVI, but some historians corrected his number in XVII despite XVI
Antipope John XVI
John XVI , born , , was an antipope from 997 to 998.-Life:He was born of Greek descent and was a native of Rossano in Calabria, southern Italy. At the time the region was a territory of the Byzantine Empire and John was the chaplain of Theophanu, the Empress consort of Emperor Otto II , who had...

 having been an antipope
Antipope
An antipope is a person who opposes a legitimately elected or sitting Pope and makes a significantly accepted competing claim to be the Pope, the Bishop of Rome and leader of the Roman Catholic Church. At times between the 3rd and mid-15th century, antipopes were typically those supported by a...

.
Sometimes called John XVII (XVIII) due to legend of another John between XIV & XV.
16
Pope John XVIII
Pope John XVIII
Pope John XVIII was Pope in Pisa from 1004 to 1009. He was born Fasanius at Rapagnano, near Ascoli Piceno, the son of a Roman priest named Leo....

1004–1009 Fasanius He took the number XVII, but some historians corrected his number to include Antipope John XVI. Sometimes called John XVIII (XIX) due to legend of another John between XIV & XV. 17
Pope John XIX
Pope John XIX
Pope John XIX , born Romanus, was Pope from 1024 to 1032.He succeeded his brother, Pope Benedict VIII , both being members of the powerful house of Tusculum...

1024–1032 Romanus He took the number XVIII, but some historians corrected his number to include Antipope John XVI. 18
Pope John XX
Pope John XX
There has never been a Pope John XX, because the 20th pope of this name, formerly Petrus Hispanus, when elected Pope in 1276, decided to skip the number XX and to be counted as John XXI instead...

There has never been a Pope John XX because Pedro Julião
Pope John XXI
Pope John XXI, , born Pedro Julião Pope John XXI, , born Pedro Julião Pope John XXI, , born Pedro Julião (Latin, Petrus Iulianus (c. 1215 – May 20, 1277), a Portuguese also called Pedro Hispano (Latin, Petrus Hispanus; English, Peter of Spain), was Pope from 1276 until his death about eight...

 on election decided to skip the number XX and to be counted as John XXI
Pope John XXI
Pope John XXI, , born Pedro Julião Pope John XXI, , born Pedro Julião Pope John XXI, , born Pedro Julião (Latin, Petrus Iulianus (c. 1215 – May 20, 1277), a Portuguese also called Pedro Hispano (Latin, Petrus Hispanus; English, Peter of Spain), was Pope from 1276 until his death about eight...

 instead. He wanted to correct what in his time was believed to be an error in the counting of his predecessors John XV
Pope John XV
Pope John XV , Pope from 985 to 996, succeeding Boniface VII . He was said to have been Pope after another Pope John that reigned four months after Pope John XIV and was named "Papa Ioannes XIV Bis" or "Pope John XIVb"...

 – XIX
Pope John XIX
Pope John XIX , born Romanus, was Pope from 1024 to 1032.He succeeded his brother, Pope Benedict VIII , both being members of the powerful house of Tusculum...

.
Pope John XXI
Pope John XXI
Pope John XXI, , born Pedro Julião Pope John XXI, , born Pedro Julião Pope John XXI, , born Pedro Julião (Latin, Petrus Iulianus (c. 1215 – May 20, 1277), a Portuguese also called Pedro Hispano (Latin, Petrus Hispanus; English, Peter of Spain), was Pope from 1276 until his death about eight...

1276–1277 Pedro Julião
romanised as Petrus Hispanus
19
Pope John XXII
Pope John XXII
Pope John XXII , born Jacques Duèze , was pope from 1316 to 1334. He was the second Pope of the Avignon Papacy , elected by a conclave in Lyon assembled by Philip V of France...

1316–1334 Jacques Duèze 20
Antipope John XXIII
Antipope John XXIII
Baldassarre Cossa was Pope John XXIII during the Western Schism. The Catholic Church regards him as an antipope.-Biography:...

1410–1415 Baldassare Cossa
Pope John XXIII
Pope John XXIII
-Papal election:Following the death of Pope Pius XII in 1958, Roncalli was elected Pope, to his great surprise. He had even arrived in the Vatican with a return train ticket to Venice. Many had considered Giovanni Battista Montini, Archbishop of Milan, a possible candidate, but, although archbishop...

1958–1963 Angelo Giuseppe Roncalli Roncalli's choice of XXIII rather than XXIV confirmed the antipope
Antipope
An antipope is a person who opposes a legitimately elected or sitting Pope and makes a significantly accepted competing claim to be the Pope, the Bishop of Rome and leader of the Roman Catholic Church. At times between the 3rd and mid-15th century, antipopes were typically those supported by a...

 status of Antipope John XXIII
Antipope John XXIII
Baldassarre Cossa was Pope John XXIII during the Western Schism. The Catholic Church regards him as an antipope.-Biography:...

.
21
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