Since early times, the Roman Church has had a special commemoration of the primatial authority of St. Peter. As witness one of the most renowned of the Apostolic Fathers, the Roman See has always held a peculiar place in the affection and obedience of orthodox believers because of its "presiding in love" and service over all the Churches of God.

"We shall find in the Gospel that Jesus Christ, willing to begin the mystery of unity in His Church, among all His disciples chose twelve; but that, willing to consummate the mystery of unity in the same Church, among the twelve He chose one. He called His disciples, said the Gospel; here are all; and among them He chose twelve. Here is the first separation, and the Apostles chosen. And these are the names of the twelve Apostles: the first, Simon, who is called Peter. [Mt. 10, 1-2] Here, in a second separation, St. Peter is set at the head, and called for that reason by the name of Peter, 'which Jesus Christ,' says St. Mark, 'had given him,' in order to prepare, as you will see, the work which He was proposing to raise all His building on that stone.

"All this is yet but a beginning of the mystery of unity. Jesus Christ, in beginning it, still spoke to many: Go, preach; I send you [see Mt. 28, 19]. Now, when He would put the last hand to the mystery of unity, He speaks no longer to many: He marks out Peter personally, and by the new name which He has given him. It is One who speaks to one: Jesus Christ the Son of God to Simon son of Jonas; Jesus Christ, who is the true Stone, strong of Himself, to Simon, who is only the stone by the strength which Jesus Christ imparts to him. It is to him that Christ speaks, and in speaking acts on him, and stamps upon him His own immovableness. And I, He says, say to you, you are Peter; and, He adds, upon this rock I will build my Church, and, He concludes, the gates of hell shall not prevail against it. [Mt. 16, 18] To prepare him for that honor Jesus Christ, who knows that faith in Himself is the foundation of His Church, inspires Peter with a faith worthy to be the foundation of that admirable building. You are the Christ, the Son of the living God. [Mt. 16, 16] By that bold preaching of the faith he draws to himself the inviolable promise which makes him the foundation of the Church.

"It was, then, clearly the design of Jesus Christ to put first in one alone, what afterwards He meant to put in several; but the sequence does not reverse the beginning, nor the first lose his place. That first word, Whatsoever you shall bind, said to one alone, has already ranged under his power each one of those to whom shall be said, Whatsoever you shall remit; for the promises of Jesus Christ, as well as His gift, are without repentance; and what is once given indefinitely and universally is irrevocable. Besides, that power given to several carries its restriction in its division, while power given to one alone, and over all, and without exception, carries with it plenitude, and, not having to be divided with any other, it has no bounds save those which its terms convey."

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In its present (ninth-century) form the "Martyrologium Hieronymianum" gives a second feast of the Chair of St. Peter for 22 February, but all the manuscripts assign it to Antioch, not to Rome. Thus the oldest manuscript, that of Berne, says: "VIII kal. mar. cathedræ sci petri apostoli qua sedit apud antiochiam". The Weissenburg manuscript says: "Natl [natale] sci petri apostoli cathedræ qua sedit apud antiocia." However, the words qua sedit apud antiochiam are seen at once to be a later addition. Both feasts are Roman; indeed, that of 22 February was originally the more important. This is clear from the Calendar of Philocalus drawn up in the year 354, and going back to the year 311; it makes no mention of the January feast but speaks thus of 22 February: "VIII Kl. Martias: natale Petri de cathedra" (eighth day before the Calends of March, the birthday [i.e. feast] of the Chair of Peter). It was not until after the insertion of Antioch in the copies of the "Martyrologium Hieronymianum" that the feast of February gave way in importance to that of January. The Roman Church, therefore, at an early date celebrated a first and a second assumption of the episcopal office in Rome by St. Peter. This double celebration was also held in two places, in the Vatican Basilica and in a cemetery (coemeterium) on the Via Salaria. At both places a chair (cathedra) was venerated which the Apostle had used as presiding officer of the assembly of the faithful. The first of these chairs stood in the Vatican Basilica, in the baptismal chapel built by Pope Damasus; the neophytes in albis (white baptismal robes) were led from the baptistery to the pope seated on this ancient cathedra, and received from him the consignatio, i.e. the Sacrament of Confirmation. Reference is made to this custom in an inscription of Damasus which contains the line: "una Petri sedes, unum verumque lavacrum" (one Chair of Peter, one true font of baptism). St. Ennodius of Pavia (d. 521) speaks of it thus ("Libellus pro Synodo", near the end): "Ecce nunc ad gestatoriam sellam apostolicæ confessionis uda mittunt limina candidatos; et uberibus gaudio exactore fletibus collata Dei beneficio dona geminantur" (Behold now the neophytes go from the dripping threshold to the portable chair of the Apostolic confession; amid abundant tears called forth by joy the gifts of Divine grace are doubled). While therefore in the apse of the Vatican Basilica there stood a cathedra on which the pope sat amid the Roman clergy during the pontifical Mass, there was also in the same building a second cathedra from which the pope administered to the newly baptized the Sacrament of Confirmation. The Chair of St. Peter in the apse was made of marble and was built into the wall, that of the baptistery was movable and could be carried. Ennodius calls the latter a gestatoria sedes; throughout the Middle Ages it was always brought on 22 February from the above-mentioned consignatorium or place of confirmation to the high altar. That day the pope did not use the marble cathedra at the back of the apse but sat on this movable cathedra, which was, consequently, made of wood. The importance of this feast was heightened by the fact that 22 February was considered the anniversary of the day when Peter bore witness, by the Sea of Tiberias, to the Divinity of Christ and was again appointed by Christ to be the Rock of His Church. According to very ancient Western liturgies, 22 February was the day "quo electus est 1. Petrus papa" (on which Peter was first chosen pope). The Mass of this feast calls it at the beginning: "solemnitatis prædicandæ dies præcipue nobilis in quo . . . . beatus Bar-Jona voce Redemptoris fide devotâ prælatus est et per hanc Petri petram basis ecclesiæ fixus est", i.e. this day is called especially praiseworthy because on it the blessed Bar-Jona, by reason of his devout faith, was raised to pre-eminence by the words of the Redeemer, and through this rock of Peter was established the foundation of the Church. And the Oratio (collect) says: "Deus, qui hodiernâ die beatum Petrum post te dedisti caput ecclesiæ, cuм te ille vere confessus sit" (O God, who didst this day give us as head of the Church, after Thyself, the Blessed Peter, etc.).

http://www.newadvent.org/cathen/03551e.htm

The feast of the Cathedra Petri was therefore celebrated on the Via Salaria on 18 January; in the Vatican Basilica it was observed on 22 February. It is easy to believe that after the triumph of Christianity the festival could be celebrated with greater pomp in the magnificent basilica erected by Constantine the Great over the confessio, or grave of Peter, than in a chapel far distant from the city on the Via Salaria. Yet the latter could rightly boast in its favour that it was there Saint Peter first exercised at Rome the episcopal office ("ubi prius sedit sanctus Petrus", as Abbot Johannes wrote, or "qua primo Rome petrus apostolus sedit", as we read in the "Martyrologium Hieronymianum" at 18 January). This double festival of the Chair of St. Peter is generally attributed to a long absence of the Apostle from Rome. As, how ever, the spot, "ubi s. Petrus baptizabat, ubi prius sedit" was distant from the city, it is natural to think that the second feast of the cathedra is connected with the opening of a chapel for Christian worship in the city itself.

http://www.newadvent.org/cathen/03551e.htm

We come now to the question, where stood originally the chair shown and venerated in the Vatican Basilica during the fourth century? On the strength of ancient tradition it has been customary to designate the church of Santa Pudenziana as the spot where, in the house of the supposed Senator Pudens, the two great Apostles not only received hospitable entertainment, but also held Christian services. But the legends connected with Santa Pudenziana do not offer sufficient guarantee for the theory that this church was the cathedral and residence of the popes before Constantine. At the close of his Epistle to the Romans (xvi, 5), St. Paul mentions a place where religious services were held, the house of Aquila and Prisca (ten kat oikon auton ekklesian — now Santa Prisca on the Aventine). Aquila and Prisca are first among the many to whom the Apostle sends salutations. Aquila's connexion with the Catacomb of Priscilla is still shown by the epitaphs of that burial place. In 1776 there was excavated on the Aventine, near the present church of Santa Prisca, a chapel with frescoes of the fourth century; in these frescoes pictures of the two Apostles were still recognizable. Among the rubbish was also found a gilded glass with the figures of Peter and Paul. The feast of the dedication of this church (an important point) still falls on the same day as the above-described cathedra feast of 22 February; this church, therefore, continued to celebrate the traditional feast even after the destruction of the object from which it sprang. In the crypt of Santa Prisca is shown a hollowed capital, bearing in thirteenth-century letters the inscription: BAPTISMUS SANCTI PETRI (Baptism of Saint Peter), undoubtedly the echo of an ancient tradition of the administration of baptism here by Peter. In this way we have linked together a series of considerations which make it probable that the spot "ubi secundo sedebat sanctus Petrus" (where Saint Peter sat for the second time), must be sought in the present church of Santa Prisca; in other words, that the chair referred to by St. Damasus was kept there in the period before Constantine. It was there, consequently, that was celebrated the "natale Petri de cathedrâ", set for 22 February in the calendars beginning with the year 354. It follows also that this is the cathedra referred to in the oldest testimonia which speak of the chair from which Peter taught at Rome. The (third-century) poem, "Adversus Marcionem", says (P.L., II, 1099):

Hâc cathedrâ, Petrus quâ sederat ipse, locatum
Maxima Roma Linum primum considere iussit.

(On this chair, where Peter himself had sat,
great Rome first placed Linus and bade him sit.)

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How Pope Damasus might be led to transfer the cathedra Petri from Santa Prisca to the Vatican, can be readily understood from the circuмstances of that time. From the reign of the first Constantine the Lateran had been the residence of the popes, and its magnificent basilica their cathedral, while the neighbouring baptistery of Constantine served for the solemn administration of baptism on the eve of Easter. In the half-century from 312 to 366 (date of the accession of Damasus), the importance of Santa Prisca, its baptistery, and its cathedra must naturally have declined. Damasus could therefore be certain of the approval of all Rome when he transferred the venerable Apostolic relic from the small chapel in Santa Prisca to his own new baptistery in the Vatican, where it certainly remained to the first quarter of the sixth century, after which it was kept in different chapels of the Vatican Basilica. During the Middle Ages it was customary to exhibit it yearly to the faithful; the newly-elected pope was also solemnly enthroned on this venerable chair, a custom that ceased at the transfer of the papal capital to Avignon, in the early part of the fourteenth century. In order to preserve for posterity this precious relic, Alexander VII (1655-67) enclosed, after the designs of Bernini, the Cathedra Petri above the apsidal altar of St. Peter's in a gigantic casing of bronze, supported by four Doctors of the Church (Ambrose, Augustine, Athanasius, Chrysostom). Thenceforth, for 200 years, it was not exhibited to the public. In 1867, however, on the occasion of the eighteenth centenary of the martyrdom of the two great Apostles, it was exposed for the veneration of the faithful. At that time the Alessandri brothers photographed the chair, and that photograph is reproduced here. The seat is about one foot ten inches above the ground, and two feet eleven and seven-eighths inches wide; the sides are two feet one and one-half inches deep; the height of the back up to the tympanum is three feet five and one-third inches; the entire height of the chair is four feet seven and one-eighth inches. According to the examination then made by Padre Garucci and Giovanni Battista de Rossi, the oldest portion (see illustration) is a perfectly plain oaken arm-chair with four legs connected by cross-bars. The wood is much worm-eaten, and pieces have been cut from various spots at different times, evidently for relics. To the right and left of the seat four strong iron rings, intended for carrying-poles, are set into the legs. At a later date, perhaps in the ninth century, this famous chair was strengthened by the addition of pieces of acacia wood. The latter wood has inlaid in it a rich ornamentation of ivory. For the adornment of the front of the seat eighteen small panels of ivory have been used, on which the labours of Hercules, also fabulous animals, have been engraved; in like manner it was common at this period to ornament the covers of books and reliquaries with ivory panels or carved stones representing mythological scenes. The back is divided by small columns and arches into four fields and finishes at the top in a tympanum which has for ornamentation a large round opening between two smaller ones. The tympanum is surrounded on all sides by strips of ivory engraved in arabesques. At the centre of the horizontal strip a picture of an emperor (not seen in the illustration) is carved in the ivory; it is held to be a portrait of Charles the Bald. The arabesque of acanthus leaves filled with fantastic representations of animals, and the rough execution of the work, would make the period of this emperor (884) a probable date. What still remains of the old cathedra scarcely permits an opinion as to the original form. In any case it was a heavy chair made of plain, straight pieces of wood, so that it cannot be considered a sella curulis of Pudens, as earlier tradition held it to be. If the four rings on the two sides belong to the original chair (Ennodius of Pavia about the sixth century used the term sedes gestatoria as an expression universally understood in reference to this chair), then it was probably an ordinary carrying-chair, such as was commonly used in ancient Rome.

http://www.newadvent.org/cathen/03551e.htm

We conclude, therefore, that there is no reason for doubting the genuineness of the relic preserved at the Vatican, and known as the Cathedra Petri. According to Eusebius, Jerusalem preserved the cathedra of St. James (Church History VII.19), Alexandria that of St. Mark (G. Secchi, La cattedra alessandrina di San Marco, Venice, 1853). Tertullian, in the above quoted passage, refers to the value placed by the Apostolic Churches on the possession of the chairs of their founders (apud quas ipsæ adhuc cathedræ apostolorum suis locis præsident), and in enumerating them he puts Rome first. Moreover, the other writers above quoted, and whose testimony reaches back to the second century, all postulate the presence in Rome of an actual Cathedra Petri,

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Simon settled in Capharnaum, where he was living with his mother-in-law in his own house (Matthew 8:14; Luke 4:38) at the beginning of Christ's public ministry (about A.D. 26-28). Simon was thus married, and, according to Clement of Alexandria (Stromata, III, vi, ed. Dindorf, II, 276), had children. The same writer relates the tradition that Peter's wife suffered martyrdom (ibid., VII, xi ed. cit., III, 306). Concerning these facts, adopted by Eusebius (Church History III.31) from Clement, the ancient Christian literature which has come down to us is silent. Simon pursued in Capharnaum the profitable occupation of fisherman in Lake Genesareth, possessing his own boat (Luke 5:3).

http://www.newadvent.org/cathen/11744a.htm

After the first meeting Peter with the other early disciples remained with Jesus for some time, accompanying Him to Galilee (Marriage at Cana), Judaea, and Jerusalem, and through Samaria back to Galilee (John 2-4). Here Peter resumed his occupation of fisherman for a short time, but soon received the definitive call of the Saviour to become one of His permanent disciples. Peter and Andrew were engaged at their calling when Jesus met and addressed them: "Come ye after me, and I will make you to be fishers of men". On the same occasion the sons of Zebedee were called (Matthew 4:18-22; Mark 1:16-20; Luke 5:1-11; it is here assumed that Luke refers to the same occasion as the other Evangelists). Thenceforth Peter remained always in the immediate neighbourhood of Our Lord. After preaching the Sermon on the Mount and curing the son of the centurion in Capharnaum, Jesus came to Peter's house and cured his wife's mother, who was sick of a fever (Matthew 8:14-15; Mark 1:29-31). A little later Christ chose His Twelve Apostles as His constant associates in preaching the kingdom of God.

http://www.newadvent.org/cathen/11744a.htm