Names
of Antipopes
What is an Antipope? In previous centuries (the last Antipope was in the 1400s), in addition to the elected pope, sometimes there was a pope with a competing claim. Often, a faction of bishops and cardinals and/or kings or other secular leaders would throw their support behind the antipope. It gets complicated, and there is sometimes still discussion about who was legit and who was not.
| Name | Latin Name | Antipapal term | Personal Name |
| Adalbert | Adalbertus | 1101-1102 | Adalbert (Adalberto, Albert, Aleric) |
| Alexander V | Alexander Quintus | 1409-1410 | Petros Philargos (was considered legit until 1963) |
| Anacletus II | Anacletus Secundus | 1130-1138 | Pietro Pierleoni |
| Anastasius III Bibliothecarius | Anastasius tertius | 855-855 | Anastasius |
| Benedict X | Antipapa Benedictus Decimus | 1058-1059 | Giovanni Mincio dei Conti di Tusculo |
| Benedict XIII | Benedictus Tertius Decimus | 1394-1423 | Pedro Martínez de Luna y Pérez de Gotor |
| Benedict XIV | Benedictus Quartus Decimus | 1424–1430 | Bernard Garnier |
| Benedict XIV | Benedictus Quartus Decimus | 1430–1437 | Jean Carrier |
| Boniface VII | Antipapa Bonifatius Septimus | 974-974, 984-985 | Francone Ferucci (Francon Ferucci) |
| Callixtus III | Callixtus Tertius | 1168-1178 | Giovanni of Struma |
| Celestine II | Antipapa Caelestinus Secundus | 1124-1124 | Teobaldo Boccapecci (Thebaldus Buccapecuc) |
| Christopher | Christoforo | 903-904 | Christoforo |
| Clement III | Antipapa Clemens Tertius | 1080-1100 | Guibert or Wibert of Ravenna |
| Clement VII | Clemens Septinus | 1378-1394 | Robert of Geneva |
| Clement VIII | Clemens Octavus | 1425-1429 | Gil Sánchez Muñoz y Carbón |
| Constantine II | Constantius Secundus | 767-768 | Konstantinus |
| Dioscore | Dioscorus | 530-530 | Dióskoros |
| Eulalius | Eulalius | 418-419 | Eulalius (Eulal) |
| Felix II | St. Felix Secundus | 355-365 | Felix |
| Felix V | Felix Quintus | 1439-1449 | Amadeus VIII of Savoy |
| Gregory VI | Antipapa Gregorius Sextus | 1012-1012 | Gregorio |
| Gregory VIII | Gregorius Octavus | 1118-1121 | Maurice Baurdain |
| Heraclius | Heraclius | 309-310 | Heraclius |
| Hippolytus | St. Hippolytus | 217-235 | Ippólytos (Hippolyt) |
| Honorius II | Antipapa Honorius Secundus | 1061-1072 | Pietro Cadalo (Petrus Cadalus) |
| Innocent III | Innocentius Tertius | 1179-1180 | Lanzo (Lando) of Sezze |
| John VIII | Ioannes Octavus | 844-844 | Giovanni |
| John XVI | Antipapa Ioannes Sextus Decimus | 997-985 | Iōánnēs Filágathos (John Philogath) |
| John XXIII | Antipapa Ioannes Vicesimus Tertius | 1410-1415 | Baldassarre Cossa |
| Laurence | Laurentius | 498-506 | Laurentius |
| Leo VIII | Antipapa Leo Octavus | 963-964 | Leone (Leon) |
| Natalius | Natalius | 199-200 | Natalius (Natal) |
| Nicholas V | Nicolaus Quintus | 1328-1330 | Pietro Rainalducci |
| Novatian | Novatianus | 251-258 | Novatianus |
| Paschal I | Paschalis | 687-687 | Pascale |
| Paschal III | Pascalis Tertius | 1164-1168 | Guido of Crema |
| Philip | Philippus | 768-768 | Philip |
| Sylvester IV | Silvester Quartus | 1105-111 | Maguinulf (Maginulfo) |
| Theodore | Theodorus | 687-687 | Theodore |
| Theodoric | Theodoricus | 1100-1101 | Theodoro |
| Ursicinus | Ursicinus | 366-367 | Ursinus (or Ursicinus) (Ursin or Ursicin) |
| Victor IV | Antipapa Victor Quartus | 1138-1138 | Gregorio Conti |
| Victor IV | Antipapa Victor Quartus | 1159-1164 | Ottaviano dei Crescenzi Ottaviabi di Monticelli |