The dogmas and traditions of the Roman Catholic Church teach that the institution of the papacy was first mandated by Biblical passages:

For Catholic Apologists the most important passage used to defend the Papacy is Matthew 16:18-19. Catholics believe that this passage shows Jesus establishing his church on the shoulders of Simon son of John, whom Jesus re-named Peter (meaning rock). Thus Peter was the rock upon which Christ's Church was built, therefore Jesus established a head to his earthly Church, calling for a successor to that head and thus the Papacy was established.

However, this interpretation of events is challenged by non-Catholics. Some say it was Peter's confession of faith that Jesus referred to. However, others propose that Jesus never called Peter rock at all but instead he was called "small stone".

The names "Petros" and "Peter" are Greek and Latin translations of the Aramaic word "Cephas," spoken by Jesus Christ. "Cephas" means "rock."

The Aramaic word for small stone is "Evna" John (1:41) is scriptural proof that, in the original Aramaic language, Jesus did not name Simon "Evna" (small stone) Christ named Simon "Cephas" (rock):

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John 1:41-42: ”He findeth first his brother Simon, and saith to him: We have found the Messias, which is, being interpreted, the Christ. And he brought him to Jesus. And Jesus looking upon him, said: Thou art Simon the son of Jona: thou shalt be called Cephas, which is interpreted Peter.”

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For the above Scripture to imply that Simon's new name was meant to be understood as "small stone," the writer would use the Latin word "calculus" which means "small stone." However, the Scripture explicitly states that "Cephas" is interpreted as "Peter." "Peter" means "rock" in Latin.

The translation of Matthew's Gospel into Greek named Simon "Petros" rather than "petra" because "petra" is a feminine noun and unsuitable for a man's name. The translator had no problem substituting the masculine form "Petros" because in Koine Greek, which was the dialect in use at the time of the New Testament, "petra" and "petros" both meant the same thing, "rock."

"Petros" and "petras" meant "small stone" and "large rock" in some ancient Greek poetry, centuries before the time of Christ, but that distinction had disappeared from the language by the time Matthew’s Gospel was rendered in Greek. As Greek scholars—even non-Catholic ones—admit, the words "petros" and "petra" were synonyms in first century Greek.

The difference between "petros" and "petras" can only be found in Attic Greek, but the New Testament was written in Koine Greek—an entirely different dialect. In Koine Greek, both "petros" and "petra" simply meant "rock." If Jesus had wanted to call Simon a small stone, the translation of Christ's Aramaic into Greek would have been "lithos," which means "small stone" in Koine Greek.

Simon-Peter's Aramaic name given by Christ is also preserved at later points in the New Testament:

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1 Corinthians 15:1-5: “For I delivered unto you first of all that which also I received: that Christ died for our sins according to the scriptures; and that he was buried; and that he hath been raised on the third day according to the scriptures; and that he appeared to Cephas; then to the twelve” (1Cor 15:3)

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Isaiah 22:22 is used to show the Old Testament connection to the "keys." The Bible further explains the position of Eliakim in Isaiah in the following:

"Then Eliakim son of Hilkiah, who was in charge of the palace..." (2 Kings 18:37)

Some Jewish commentators of the Old Testament understood Numbers 23:9 in a manner similar to Peter with this commentary from the Jewish Encyclopedia on Peter regarding Abraham:

"Upon Abraham as top of the rocks God said I shall build my kingdom"

The reference to the "keys of the kingdom of heaven" here are the basis for the symbolic keys often found in Catholic papal symbolism, such as in the Vatican Coat of Arms .

Election

The pope was originally chosen by those senior clergymen resident in and near Rome. In 1059 the electorate was restricted to the Cardinals of the Holy Roman Church, and the individual votes of all Cardinal Electors were made equal in 1179. Pope Urban VI, elected 1378, was the last pope who was not already a cardinal at the time of his election. Canon law requires that if a layman or non-bishop is elected, he receives episcopal consecration from the Dean of the College of Cardinals before assuming the Pontificate. Under present canon law, the pope is elected by the cardinal electors, comprising those cardinals who are under the age of 80.

The Second Council of Lyons was convened on 7 May 1274, to regulate the election of the pope. This Council decreed that the cardinal electors must meet within ten days of the pope's death, and that they must remain in seclusion (see Papal conclave) until a pope has been elected; this was prompted by the three-year Sede Vacante following the death of Pope Clement IV in 1268. By the mid-sixteenth century, the electoral process had more or less evolved into its present form, allowing for alteration in the time between the death of the pope and the meeting of the cardinal electors.

Traditionally, the vote was conducted by acclamation, by selection (by committee), or by plenary vote. Acclamation was the simplest procedure, consisting entirely of a voice vote, and was last used in 1621. Pope John Paul II abolished vote by acclamation and by selection by committee, and henceforth all Popes will be elected by full vote of the Sacred College of Cardinals by ballot.

The election of the pope almost always takes place in the Sistine Chapel, in a sequestered meeting called a "conclave" (so called because the cardinal electors are theoretically locked in, cum clave, until they elect a new pope). Three cardinals are chosen by lot to collect the votes of absent cardinal electors (by reason of illness), three are chosen by lot to count the votes, and three are chosen by lot to review the count of the votes. The ballots are distributed and each cardinal elector writes the name of his choice on it and pledges aloud that he is voting for "one whom under God I think ought to be elected" before folding and depositing his vote on a plate atop a large chalice placed on the altar (in the 2005 conclave, a special urn was used for this purpose instead of a chalice and plate). The plate is then used to drop the ballot into the chalice, making it difficult for any elector to insert multiple ballots. Before being read, the number of ballots are counted while still folded; if the total number of ballots does not match the number of electors, the ballots are burned unopened and a new vote is held. Otherwise, each ballot is read aloud by the presiding Cardinal, who pierces the ballot with a needle and thread, stringing all the ballots together and tying the ends of the thread to ensure accuracy and honesty. Balloting continues until a Pope is elected by a two-thirds majority (with the promulgation of Universi Dominici Gregis in 1996, a simple majority after a deadlock of twelve days was allowed, but this was revoked by Pope Benedict XVI by Motu Proprio in 2007).

One of the most famous aspects of the papal election process is the means by which the results of a ballot are announced to the world. Once the ballots are counted and bound together, they are burned in a special stove erected in the Sistine Chapel, with the smoke escaping through a small chimney visible from St. Peter's Square. The ballots from an unsuccessful vote are burned along with a chemical compound in order to produce black smoke, or fumata nera. (Traditionally, wet straw was used to help create the black smoke, but a number of "false alarms" in past conclaves have brought about this concession to modern chemistry.) When a vote is successful, the ballots are burned alone, sending white smoke (fumata bianca) through the chimney and announcing to the world the election of a new pope. At the end of the conclave that elected Pope Benedict XVI, church bells were also rung to signal that a new pope had been chosen.

The Dean of the College of Cardinals then asks the cardinal who has been successfully-elected two solemn questions. First he asks, "Do you freely accept your election?" If he replies with the word "Accepto", his reign as Pope begins at that instant, not at the inauguration ceremony several days afterward. The Dean then asks, "By what name shall you be called?" The new pope then announces the regnal name he has chosen for himself. (If the Dean himself is elected pope, the Vice Dean performs this duty).

The new pope is led through the "Door of Tears" to a dressing room in which three sets of white papal vestments (immantatio) await: small, medium, and large. Donning the appropriate vestments and reemerging into the Sistine Chapel, the new pope is given the "Fisherman's Ring" by the Cardinal Camerlengo, whom he first either reconfirms or reappoints. The pope then assumes a place of honor as the rest of the cardinals wait in turn to offer their first "obedience" (adoratio) and to receive his blessing.

The senior Cardinal Deacon then announces from a balcony over St. Peter's Square the following proclamation: Annuntio vobis gaudium magnum! Habemus Papam! ("I announce to you a great joy! We have a pope!"). He then announces the new pope's Christian name along with the new name he has adopted as his regnal name.

Until 1978 the pope's election was followed in a few days by the Papal Coronation. A procession with great pomp and circumstance formed from the Sistine Chapel to St. Peter's Basilica, with the newly elected pope borne in the sedia gestatoria. There, after a solemn Papal Mass, the new pope was crowned with the triregnumn(papal tiara) and he gave for the first time as pope the famous blessing Urbi et Orbi ("to the City [Rome] and to the World"). Another renowned part of the coronation was the lighting of a bundle of flax at the top of a gilded pole, which would flare brightly for a moment and then promptly extinguish, with the admonition Sic transit gloria mundi ("Thus passes worldly glory"). A similar sombre warning against papal hubris made on this occasion was the ritual exclamation "Annos Petri non videbis", reminding the newly crowned Pope that he would not live to see his rule lasting as long as that of St. Peter, who according to tradition headed the church for 35 years and has thus far been the longest reigning Pope in the history of the Catholic Church.

A traditionalist Catholic belief claims the existence of the Papal Oath (not to be confused with the Oath Against Modernism mandated by Pope Pius X), which the popes from John Paul I on are said to have refused to swear, but there is no reliable authority for this claim.

The Latin term sede vacante ("vacant seat") refers to a papal interregnum, the period between the death of a pope and the election of his successor. From this term is derived the term sedevacantism, which designates a category of dissident Catholics who maintain that there is no canonically and legitimately elected Pope, and that there is therefore a Sede Vacante. One of the most common reasons for holding this belief is the idea that the reforms of the Second Vatican Council and especially the replacement of the Tridentine Mass with the Mass of Pope Paul VI are heretical, and that, per the dogma of papal infallibility, it is impossible for a valid Pope to have done these things. Secevacantists are considered to be schismatics by the mainstream Roman Catholic Church.

For centuries, the papacy was an institution dominated by Italians. Prior to the election of the Polish cardinal Karol Wojtyla as Pope John Paul II in 1978, the last non-Italian was Pope Adrian VI of the Netherlands, elected in 1522. John Paul II was followed by the first German-born Benedict XVI, leading some to believe the Italian domination of the papacy to be over.

History

Marcellinus (d. 304) is the first Bishop of Rome whom sources show used the title of "pope". In the 11th century, Pope Gregory VII declared the term "Pope" to be reserved for the Bishop of Rome.

Early bishops occupying the See of Rome were designated "Vicar of Peter" (St. Peter being considered "Prince of the Apostles" or leader of the apostolic Church); for later popes the more authoritative-sounding "Vicar of Christ" was substituted. The designation "Vicar of Christ" was first used by the Roman Synod of 495 to refer to Pope Gelasius I, an advocate of papal supremacy. The title "Vicar of Christ" refers to the Pope's claims of divine commission. Tertullian (c. 160 – c. 220) used the phrase "Vicar of Christ" of the Holy Spirit with regard to the Spirit's role of maintaining in the Church the teaching given by the apostles:

"Grant, then, that all have erred; that the apostle was mistaken in giving his testimony; that the Holy Ghost had no such respect to any one (church) as to lead it into truth, although sent with this view by Christ, ... grant also that He, the Steward of God, the Vicar of Christ neglected His office, permitting the churches for a time to understand differently, (and) to believe differently, what He Himself was preaching by the apostles,— is it likely that so many churches, and they so great, should have gone astray into one and the same faith?"^[16]

He also referred to the Holy Spirit as the "Vicar of the Lord":

"For what kind of (supposition) is it, that, while the devil is always operating and adding daily to the ingenuities of iniquity, the work of God should either have ceased, or else have desisted from advancing? whereas the reason why the Lord sent the Paraclete was, that, since human mediocrity was unable to take in all things at once, discipline should, little by little, be directed, and ordained, and carried on to perfection, by that Vicar of the Lord, the Holy Spirit."^[17]

The Second Vatican Council confirmed the titles "Vicar of Christ" and "Successor of Peter" or "Successor of the Prince of the Apostles" as titles of the pope.

The term "Supreme Pontiff" (Summus Pontifex) or, more completely, "Supreme Pontiff of the Universal Church" (Summus Pontifex Ecclesiae Universalis) is another of the official titles of the Pope.

The ancient title Pontifex Maximus, which dates back to the early years of the Roman Republic, and, beginning with Julius Caesar, was associated with the Roman Emperors, until Gratian (359-383), under the influence of Saint Ambrose, formally renounced the title, is not included in the official list of the Pope's titles, but is commonly found in inscriptions on buildings erected in the time of a particular Pope. It is usually abbreviated as "Pont. Max." or as "P.M." The phrase literally means "Greatest Pontifex", but is often rendered as "Supreme Pontiff", which is instead a literal translation of "Summus Pontifex".

The title "Servant of the Servants of God", although used by Church leaders including St. Augustine and St. Benedict, was first used by Pope St. Gregory the Great in his dispute with the Patriarch of Constantinople after the latter assumed the title "Ecumenical Patriarch". It was not reserved for the pope until the thirteenth century. The documents of the Second Vatican Council reinforced the understanding of this title as a reference to the pope's role as a function of collegial authority, in which the Bishop of Rome serves the world's bishops.

The best-known title of the Popes, that of "Pope", does not appear in the official list, but is commonly used in the titles of documents, and appears, in abbreviated form, in their signatures. Thus Pope Paul VI signed as "Paulus PP. VI", the "PP." standing for "Papa" ("Pope").

The signature of papal bulls is customarily N. Episcopus Ecclesiae Catholicae ("N. Bishop of the Catholic Church"), while the heading is N. Episcopus Servus Servorum Dei ("N. Bishop and Servant of the Servants of God").

The full list of the official titles of Pope Benedict XVI, as published in the Annuario Pontificio is as follows: "Benedict XVI, Bishop of Rome, Vicar of Jesus Christ, Successor of the Prince of the Apostles, Supreme Pontiff of the Universal Church, Primate of Italy, Archbishop and Metropolitan of the Province of Rome, Sovereign of the State of Vatican City, Servant of the Servants of God".

Other titles commonly used are "His Holiness", "Holy Father". In Spanish and Italian, "Beatísimo/Beatissimo Padre" (Most Blessed Father) is often used in preference to "Santísimo/Santissimo Padre" (Most Holy Father). In the medieval period, "Dominus Apostolicus" ("the Apostolic Lord") was also used.

The pope's official seat or cathedral is the Basilica of St. John Lateran, and his official residence is the Palace of the Vatican. He also possesses a summer residence at Castel Gandolfo (situated on the site of the ancient city of Alba Longa). Until the time of the Avignon Papacy, the residence of the Pope was the Lateran Palace, donated by the Roman Emperor Constantine the Great.

The Pope's ecclesiastical jurisdiction (the Holy See) is distinct from his secular jurisdiction (Vatican City). It is the Holy See which conducts international relations; for hundreds of years, the papal court (the Roman Curia) has functioned as the government of the Catholic Church.

The names "Holy See" and "Apostolic See" are in ecclesiastical terminology the ordinary jurisdiction of the Bishop of Rome (including the Roman Curia); the pope's various honors, powers, and privileges within the Catholic Church and the international community derive from his Episcopate of Rome in lineal succession from the Apostle Saint Peter (see Apostolic Succession). Consequently, Rome has traditionally occupied a central position in the Catholic Church, although this is not necessarily so. The pope derives his Pontificate from being Bishop of Rome but is not required to live there; according to the Latin formula ubi Papa, ibi Curia, wherever the Pope resides is the central government of the Church, provided that the pope is Bishop of Rome. As such, between 1309 and 1378, the popes lived in Avignon (see Avignon Papacy), a period often called the Babylonian Captivity in allusion to the Biblical exile of Israel.

Since in the Eastern Churches the title "pope" does not unambiguously refer to the Bishop of Rome, they often use the expression "Pope of Rome", whether they are in communion with Rome or not.