In Roman Catholicism, a person who tries to take the place of the legitimately elected pope. Some antipopes were elected by factions in doctrinal disagreements, and others were chosen in double elections arbitrated by secular authorities or picked as third candidates in an effort to resolve such disputes. The earliest of the antipopes appeared in the 3rd century. During the Investiture Controversy, Henry IV appointed an antipope, and several more antipopes claimed the papal office over the next 200 years as a result of disputed elections or further struggles with secular rulers. The principal age of the antipope came after the papal court was moved from Rome to Avignon in the 14th century (see Avignon papacy), an event that led to the Western Schism of 1378–1417. During this era, the popes now considered canonical were elected in Rome, and the antipopes were elected in Avignon.
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An antipope (Latin: antipapa) is a person who makes a widely accepted claim to be the lawful pope, in opposition to the pope recognised by the Roman Catholic Church. In the past antipopes were typically those supported by a fairly significant faction of cardinals and kingdoms. Persons who claim to be the pope but have few followers, such as the modern sedevacantist antipopes, are not generally counted as antipopes, and therefore are ignored for regnal numbering.
In its list of the popes, the Holy See's annual directory, Annuario Pontificio, attaches to the name of Pope Leo VIII (963-965) the following note: "At this point, as again in the mid-eleventh century, 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."
The Catholic Encyclopedia also mentions a Natalius, before Hippolytus, as first antipope, who, according to Eusebius's EH5.28.8-12, quoting the Little Labyrinth of Hippolytus, after being "scourged all night by the holy angels", covered in ash, dressed in sackcloth, and "after some difficulty", tearfully submitted to Pope Zephyrinus. As proof of the angels' actual intervention, Natalius displayed the wounds they had left on his back.
Novatian (d. 258), another third-century figure, certainly claimed the See of Rome in opposition to Pope Cornelius, and is thus reckoned as the first unequivocal antipope. The period when antipopes were most numerous was during the struggles between the popes and the Holy Roman Emperors of the 11th and 12th centuries. The emperors frequently imposed their own nominees in order to further their cause. The popes, likewise, sometimes sponsored rival imperial claimants in Germany in order to overcome a particular emperor.
The Great Western Schism, which, on the grounds of the allegedly invalid election of Pope Urban VI, began in 1378 with the election of Clement VII, who took up residence in Avignon, France, led to two, and eventually three, rival lines of claimants to papacy: the Roman line, the Avignon line, and the Pisan line. The last-mentioned line was named after the town of Pisa, Italy, where the council that elected Alexander V as a third claimant was held. To end the schism, in May 1415, the Council of Constance deposed John XXIII of the Pisan line, whose claim to legitimacy was based on a council's choice. Pope Gregory XII of the Roman line resigned in July 1415. In 1417, the Council of Florence also formally deposed Benedict XIII of the Avignon line, but he refused to resign. Afterwards, Pope Martin V was elected and was accepted everywhere, except in the small and rapidly diminishing area that remained faithful to Benedict XIII. The scandal of the Great Schism created anti-papal sentiment and fed into the Protestant Reformation at the turn of the 16th century.
As for Sylvester III, sometimes listed as an antipope, the Holy See's Annuario Pontificio classifies him as a pope, not an antipope. In line with its above-quoted remark on the obscurities about the canon law of the time and the historical facts, especially in the mid-eleventh century (see the second paragraph of this article), it makes no judgement on the legitimacy of his takeover of the position of pope in 1045. The Catholic Encyclopedia places him in its List of Popes, though with the annotation: "Considered by some to be an antipope".
They are usually religious leaders of breakaway Roman Catholic groups who reject the commonly recognized popes (sedevacantist groups), For this reason they are often called "sedevacantist antipopes". Claiming to have elected a pope in a "conclave" of perhaps half a dozen laypeople (conclavism), they hold that, because of their action, the see of Rome is no longer vacant and they are no longer sedevacantists.
A significant number of them have taken the name Peter II, due to its special significance.
The Roman Catholic Church regards them as excommunicated schismatics and in some cases as heretics.
Those listed below have a very limited following, ranging from very few to some hundreds, and accordingly are not antipopes in the historical sense of the term.
Michel Collin (1905-1974) claimed to have been made pope as Clement XV, even while Pius XII was alive, and in 1963 founded the ultra-liberal, ultra-modernist "The Renewed Church of Christ" or "Church of the Magnificat," based first in Lyons, then at St. Jovite, Quebec, Canada. The Colinites have since disintegrated into several factions, with one successor pope in France.
A larger faction is led by Jean-Gaston Tremblay, one of Colin's disciples, who declared himself constituted pope by apparition, even before Colin had died, and who calls himself "John-Gregory XVII." He is now based in St. Jovite, as head of the "Order of the Magnificat" and The Apostles of the Latter Days. The 1846 secret of Mélanie Calvat, which called for the constitution of these Apostles of the Latter Days is central to his claims and mission.
The Palmarian Catholic Church regards as true popes those until 1978, including Pope Paul VI, who is revered by them as a martyr. Palmarians do not claim the See of Rome, but hold that the Pope of Rome is excommunicated and that the position of the Holy See has been transferred to the See of El Palmar de Troya, on the grounds of claimed apparitions.