Pope John XX
Encyclopedia
There has never been a Pope John XX, because the 20th pope of this name, formerly Petrus Hispanus
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...

, when elected Pope in 1276, 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"...

 to 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...

.

Details

Confusion in numbering Popes John results from an error in the textual transmission of the entry on John XIV (983/984) in the Liber Pontificalis
Liber Pontificalis
The Liber Pontificalis is a book of biographies of popes from Saint Peter until the 15th century. The original publication of the Liber Pontificalis stopped with Pope Adrian II or Pope Stephen V , but it was later supplemented in a different style until Pope Eugene IV and then Pope Pius II...

. This entry originally specified not only the duration of his pontificate ("VIII mens." = eight months), but also the duration of his ensuing imprisonment by 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...

 Boniface VII, "per IV menses" ("for four months"). In the 11th century, some time after the pontificate of John XIX, this entry on John XIV was misread to be referring to two different popes John, the first reigning for eight months and directly succeeded by another John reigning for four months:
Iohannes m. VIII ("John, eight months")
Iohannes m. IV ("John, four months")


In distinguishing these two Johns, the second one came to be numbered as "Iohannes XIV. bis" ("John XIV the second") and it was confused with a historic character, the cardinal deacon John son of Robert, who opposed Boniface VII after John XIV's death. Given the fact that the following Popes John, from John XV (985–996) until John XIX (1024–1034), seemed to have neglected the existence of John XIV "bis", Petrus Hispanus meant to correct this error by electing for himself the name John XXI.
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