Antipope

Antipope is a term of the Roman Catholic Church in the context of its official list of popes. "List of Popes,"  Catholic Encyclopedia (2009); retrieved 2011-11-8.  An antipope is not included in the list of popes in the Vatican's annual directory, Annuario PontificioCuria Romana. (2008). Annuario Pontificio, p. 12; excerpt, "... we come across elections in which problems of harmonising historical criteria and those of theology and canon law make it impossible to decide clearly which side possessed the legitimacy whose factual existence guarantees the unbroken lawful succession of the successors of Saint Peter. The uncertainty that in some cases results has made it advisable to abandon the assignation of successive numbers in the list of the popes."

An antipope is a pretender who falsely claims to be pope or who wrongly opposes the legitimate and recognized pope."Antipope" Catholic Encyclopedia; retrieved 2011-11-8.

The existence or claims of an antipope produces a schism in the Roman Catholic Church.  A conflict is caused by those who are opposing the authority of the pope.

 List of antipopes (Mercati's List) 
Coat of ArmsAntipopeImageLatin NameSecular NamePlace of BirthPontificateAgeHippolytus80pxHippolytusAsia Minor, Roman Empire (Turkey)217–235 IIINovatianNovatianusMarch 251 – 258Felix II80pxFelixSecundus355 – 22 November 365 IVUrsinusUrsinusSeptember 366 – November 367EulaliusEulalius27 December or 29 December 418 – 3 April 419 VLaurentiusLaurentius1) 22 November 498 – February 4992) 501–505Dioscorus 22 September 530 – 14 October 530 VITheodorusTheodorus687 VIIPaschalPaschalis687Constantine IIConstantinusSecundus5 July 767 – 6 August 768 VIIIPhilipPhilippus31 July 768John VIIIIoannesOctavusJanuary 844 IXAnastasius IIIAnastasiusTertiusAugust 855 – September 855Christopher60pxChristophorusRome, Papal States (Italy)July or September 903 – January 904 XBoniface VIIAgain|
|BonifaciusSeptimus|Franco
|Italy
|August 984 – July 985
|-
|
|John XVI|80px
|IoannesSextus Decimus|John Philagathus (Filogatos)
|Rossano, County of Calabria (Italy)
|April 997 – February 998
|-
|
|Gregory VI|
|GregoriusSextus|
|
|1012
|rowspan=4 style="text-align:center;" | XI
|-
|
|Benedict X|
|BenedictusDecimus|Giovanni Mincius
|Rome, Papal States (Italy)
|5 April 1058 – 24 January 1059
|-
|
|Honorius II|
|HonoriusSecundus|Peter Cadalus
|Rome, Papal States (Italy)
|28 October 1061 – 1064/1072
|-
|
|Clement III|80px
|ClemensTertius|Wibert of Ravenna
|Parma, Holy Roman Empire (Italy)
|1) 26 June 10802) 24 May 1084 – 8 September 1100
|-
|
|Theodoric|
|Theodoricus|
|
|September 1100 – January 1101
| rowspan="10" style="text-align:center;" | XII
|-
|
|Albert|
|Albertus|
|Italy
|February – March 1102
|-
|
|Sylvester IV|
|SilvesterQuartus|Maginulf
|Germany or Italy
|18 November 1105 – 12 April 1111
|-
|
|Gregory VIII|60px
|GregoriusOctavus|Maurice
|Limousin, Kingdom of France (France)
|8 March 1118 – April 1121
|-
|
|Anacletus II|
|AnacletusSecundus|Pietro Pierleoni OSB|Rome, Papal States (Italy)
|14 February 1130 – 25 January 1138
|-
|
|Victor IV|
|VictorQuartus|Gregorio de Ceccano
|Ceccano, Papal States (Italy)
|March 1138 – 29 May 1138
|-
|
|Victor IV|
|VictorQuartus|Ottaviano de Monticello
|Rome, Papal States (Italy)
|7 September 1159 – 20 April 1164
|-
|
|Paschal III|80px
|PaschalisTertius|Guido di Crema
|Crema, Holy Roman Empire (Italy)
|22 April 1164 – 20 September 1168
|-
|
|Callistus III|
|CallistusTertius|Giovanni de Struma OSB|Tuscany, Holy Roman Empire (Italy)
|September 1168 – 29 August 1178
|-
|
|Innocent III|
|InnocentiusTertius|Lando de Sittino
|Lazio, Papal States (Italy)
|29 September 1179 – January 1180
|-
|80px
|Nicholas V|80px
|NicolausQuintus|Pietro Rainalducci OFM
|Borgorose, Italy
|May 12, 1328 –August 25, 1330
| rowspan="3" |XIV
|-
|70px
|Clement VII|80px
|ClemensSeptimus|Robert of Geneva
|Geneva, Holy Roman Empire (Switzerland)
|September 20, 1378 – September 16, 1394
|-
|70px
|Benedict XIII|80px
|BenedictusTertius Decimus|Pedro de Luna
|Illueca, Spain
|September 28, 1394 – July 26, 1417
|-
|70px
|Alexander V|80px
|AlexanderQuintus|Pietro PhilarghiOFM|Crete, Republic of Venice (Greece)
|June 26, 1409 – May 3, 1410
|rowspan=3 style="text-align:center;" | XV
|-
|70px
|John XXIII|80px
|IoannesVicesimus Tertius|Baldassare Cossa
|Naples, Kingdom of Naples (Italy)
|May 17, 1410 – May 29, 1415
|-
|70px
|Felix V|80px
|FelixQuintus''Amadeus VIIIChambéry, Duchy of Savoy (France)November 5, 1439 – April 7, 1449

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Category:Lists of popes