I noticed, when studying the Acts of Ecumenical Councils from before the Great Schism, that the Pope was often referred to or described there in ways that seem to correspond with the present Catholic view of the Pope rather than with that of the Orthodox, Anglicans, etc.  Here are some of interesting quotes from these Acts and from related documents which can be found here.  I have made liberal use of boldface and underlining to emphasize what I think are the most significant words and phrases, at least with respect to how the Pope was viewed in those times.

The point of all this is the following: it would seem that the Christians of those times, both East and West, agreed with the Catholic-sounding views of the Papacy expressed here. Those I quote believe in what they themselves say, of course. But everyone else also agreed with those views, and this is shown by the fact that no one expressed any disagreement with them. After all, the Ecumenical Councils were where heretical views were supposed to be corrected, and so if there were anything wrong expressed at those councils, it would have been the ideal time to correct those errors. And yet no one did object, despite the fact that these Catholic views of the Papacy were repeated over and over again throughout the councils of the first millennium.

And if your holiness have not a mind to this according to the limits defined in the writings of our brother of blessed memory and most reverend fellow-minister Celestine, Bishop of the Church of Rome, be well assured then that you have no lot with us, nor place or standing (logon) among the priests and bishops of God.
 
 

As, in addition to other things, the impious Nestorius has not obeyed our citation, and did not receive the holy bishops who were sent by us to him, we were compelled to examine his ungodly doctrines. We discovered that he had held and published impious doctrines in his letters and treatises, as well as in discourses which he delivered in this city, and which have been testified to. Compelled thereto by the canons and by the letter (anagkaiwV katepeixqenteV apo te twn kanonwn, kai ek thV epistolhV, k. t. h.) of our most holy father and fellow-servant Coelestine, the Roman bishop, we have come, with many tears, to this sorrowful sentence against him, namely, that our Lord Jesus Christ, whom he has blasphemed, decrees by the holy Synod that Nestorius be excluded from the episcopal dignity, and from all priestly communion.
 
 

Philip the presbyter and legate of the Apostolic See said: We bless the holy and adorable Trinity that our lowliness has been deemed worthy to attend your holy Synod. For a long time ago (palai) our most holy and blessed pope Coelestine, bishop of the Apostolic See, through his letters to that holy and most pious man Cyril, bishop of Alexandria, gave judgment concerning the present cause and affair (wrisen) which letters have been shown to your holy assembly. And now again for the corroboration of the Catholic (kaqolikhV) faith, he has sent through us letters to all your holinesses, which you will bid (pelousate) to be read with becoming reverence (prepontwV) and to be entered on the ecclesiastical minutes.
Arcadius, a bishop and legate of the Roman Church said: May it please your blessedness to give order that the letters of the holy and ever-to-be-mentioned-with-veneration Pope Coelestine, bishop of the Apostolic See, which have been brought by us, be read, from which your reverence will be able to see what care he has for all the Churches.

Cyril, the bishop of Alexandria said: Let the letter received from the most holy and altogether most blessed Coelestine, bishop of the Apostolic See of Rome be read to the holy Synod with fitting honour.
 
 

... Out of our solicitude, we have sent our holy brethren and fellow priests, who are at one with us and are most approved men, Arcadius, and Projectus, the bishops, and our presbyter, Philip, that they may be present at what is done and may carry out what things have been already decreed by us (quae a nobis antea statuta sunt, exequatur).
To the performing of which we have no doubt that your holiness will assent when it is seen that what has been decreed is for the security of the whole church.
 
 

Philip, presbyter and legate of the Apostolic See said: We offer our thanks to the holy and venerable Synod, that when the writings of our holy and blessed pope had been read to you, the holy members by our [or your] holy voices, ye joined yourselves to the holy head also by your holy acclamations. For your blessedness is not ignorant that the head of the whole faith, the head of the Apostles, is blessed Peter the Apostle. And since now our mediocrity, after having been tempest-tossed and much vexed, has arrived, we ask that ye give order that there be laid before us what things were done in this holy Synod before our arrival; in order that according to the opinion of our blessed pope and of this present holy assembly, we likewise may ratify their determination.

Philip the presbyter and legate of the Apostolic See said: There is no doubt, and in fact it has been known in all ages, that the holy and most blessed Peter, prince (exarkoV) and head of the Apostles, pillar of the faith, and foundation (qemelioV) of the Catholic Church, received the keys of the kingdom from our Lord Jesus Christ, the Saviour and Redeemer of the human race, and that to him was given the power of loosing and binding sins: who down even to to-day and forever both lives and judges in his successors. The holy and most blessed pope Coelestine, according to due order, is his successor and holds his place, and us he sent to supply his place in this holy synod, which the most humane and Christian Emperors have commanded to assemble, bearing in mind and continually watching over the Catholic faith.

Projectus, bishop and legate of the Roman Church said:  . . . Moreover I also, by my authority as legate of the holy Apostolic See, define, being with my brethren an executor (ekbibasthV) of the aforesaid sentence, that the beforenamed Nestorius is an enemy of the truth, a corrupter of the faith, and as guilty of the things of which he was accused, has been removed from the grade of Episcopal honour, and moreover from the communion of all orthodox priests.
 
 

...The zeal of your holiness for piety, and your care for the right faith, so grateful and highly pleasing to God the Saviour of us all, are worthy of all admiration. For it is your custom in such great matters to make trial of all things, and the confirmation of the Churches you have made your own care. But since it is right that all things which have taken place should be brought to the knowledge of your holiness, we are writing of necessity [to inform you] that, by the will of Christ the Saviour of us all, and in accordance with the orders of the most pious and Christ-loving Emperors, we assembled together in the Metropolis of the Ephesians from many and far scattered regions, being in all over two hundred bishops.

With our brethren and fellow-ministers, both Cyril the bishop and Memnon, who had endured reproval at their hands, we are all in communion, and after the rashness [of their accusers] we both have and do perform the liturgy in common, all together celebrating the Synaxis, having made of none effect their play in writing, and having thus shewn that it lacked all validity and effect. For it was mere reviling and nothing else. For what kind of a synod could thirty men hold, some of whom were marked with the stamp of heresy, and some without sees and ejected [from their dioceses]? Or what strength could it have in opposition to a synod gathered from all the whole world? For there were sitting with us the most reverend bishops Arcadius and Projectus, and with them the most holy presbyter Philip, all of whom were sent by your holiness, who gave to us your presence and filled the place of the Apostolic See (thV apostolikhV kaqedraV).and Christ-loving Emperors, we assembled together in the Metropolis of the Ephesians from many and far scattered regions, being in all over two hundred bishops.
 
 

Paschasinus, the most reverend bishop and legate of the Apostolic See, stood up in the midst with his most reverend colleagues and said: We received directions at the hands of the most blessed and apostolic bishop of the Roman city, which is the head of all the churches, which directions say that Dioscorus is not to be allowed a seat in this assembly, but that if he should attempt to take his seat he is to be cast out. This instruction we must carry out; if now your holiness so commands let him be expelled or else we leave.

Lucentius, the most reverend bishop having the place of the Apostolic See, said: ... And he [Dioscorus] dared to hold a synod without the authority of the Apostolic See, a thing which had never taken place nor can take place.
Paschasinus the most reverend bishop, holding the place of the Apostolic See said: We cannot go counter to the decrees of the most blessed and apostolic bishop ["Pope" for "bishop" in the Latin], who governs the Apostolic See, nor against the ecclesiastical canons nor the patristic traditions.

Lucentius, the most reverend bishop, and legate of the Apostolic See, said: Since the faith of Flavian of blessed memory agrees with the Apostolic See and the tradition of the fathers it is just that the sentence by which he was condemned by the heretics should be turned back upon them by this most holy synod.
 
 

To the same purpose the all-wise Peter also said when he wrote of Christ as having "suffered in the flesh," and not in the nature of his ineffable godhead.
 
 

Whereupon the blessed Peter, as inspired by God, and about to benefit all nations by his confession, said, "Thou art the Christ, the Son of the living God." Not undeservedly, therefore, was he pronounced blessed by the Lord, and derived from the original Rock that solidity which belonged both to his virtue and to his name, who through revelation from the Father confessed the selfsame to be both the Son of God and the Christ
 
 

After the reading of the foregoing epistle [the Tome of Leo], the most reverend bishops cried out: This is the faith of the fathers, this is the faith of the Apostles. So we all believe, thus the orthodox believe. Anathema to him who does not thus believe. Peter has spoken thus through Leo. So taught the Apostles. Piously and truly did Leo teach, so taught Cyril. Everlasting be the memory of Cyril. Leo and Cyril taught the same thing, anathema to him who does not so believe. This is the true faith. Those of us who are orthodox thus believe. This is the faith of the fathers. Why were not these things read at Ephesus [i.e. at the heretical synod held there] ? These are the things Dioscorus hid away.
 
 

Paschasinus the bishop of Lilybaeum, in the province of Silicia, and holding the place of the most holy Leo, archbishop of the Apostolic see of old Rome, said in Latin what being interpreted is as follows: It is well known to this beloved of God synod, that divine letters were sent to the blessed and apostolic pope Leo, inviting him to deign to be present at the holy synod. But since ancient custom did not sanction this, nor the general necessity of the time seemed to permit it, he commanded our littleness to preside in his place over this holy council, and therefore it is necessary that whatever things are brought into discussion should be examined by our interference (dialaliaV). Therefore let the book presented by our most beloved-of-God brother, and fellow-bishop Eusebius be received, and read by the beloved of God archdeacon and primicerius of the notaries, Aetius.
 
 

[Next follows the petition of Eusebius et post nonnulla four petitions each addressed to "The most holy and beloved-of-God ecumenical archbishop and patriarch of great Rome Leo, and to the holy and ecumenical Synod assembled at Chalcedon, etc., etc. ;" ...the Roman Legates spoke together, and in their speech occurs the following:]
Wherefore the most holy and blessed Leo, archbishop of the great and elder Rome, through us, and through this present most holy synod together with the thrice blessed and all-glorious Peter the Apostle, who is the rock and foundation of the Catholic Church, and the foundation of the orthodox faith, hath stripped him of the episcopate, and hath alienated from him all hieratic worthiness. Therefore let this most holy and great synod sentence the before mentioned Dioscorus to the canonical penalties.
 
 

Paschasinus and Lucentius, the most reverend bishops, and Boniface the most reverend presbyter, legates of the Apostolic See through that most reverend man, bishop Paschasinus said: ... And in the third place the writings of that blessed man, [Pope] Leo, Archbishop of all the churches, who condemned the heresy of Nestorius and Eutyches, shew what the true faith is.
 
 

Paschasinus and Lucentius the most reverend bishops and Boniface a presbyter, vicars of the Apostolic See of Rome, said: If they do not agree to the letter of that apostolic and blessed man, Pope Leo, give directions that we be given our letters of dismission, and let a synod be held there [i. e. in the West].
...
The most blessed bishops of Illyria said: Let those who contradict be made manifest. Those who contradict are Nestorians. Those who contradict, let them go to Rome.
[I'm not sure what the two above quotes are implying...  Is a Western synod more authoritative than an Eastern synod?]

The most magnificent and glorious judges said: Add then to the definition, according to the judgment of our most holy father Leo, that there are two natures in Christ united unchangeably, inseparably, unconfusedly.
 
 

And, for the confirmation of the orthodox doctrines, it has rightly added to these the letter of the President of the great and old Rome, the most blessed and holy Archbishop Leo, which was addressed to Archbishop Flavian of blessed memory, for the removal of the false doctrines of Eutyches, judging them to be agreeable to the confession of the great Peter, and as it were a common pillar against misbelievers.
 
 

Lucentius, the bishop, said: The Apostolic See gave orders that all things should be done in our presence [This sentence reads in the Latin: The Apostolic See ought not to be humiliated in our presence. ]; and therefore whatever yesterday was done to the prejudice of the canons during our absence, we beseech your highness to command to be rescinded. But if not, let our opposition be placed in the minutes, and pray let us know clearly [Lat. that we may know] what we are to report to that most apostolic bishop who is the ruler of the whole church [i.e. the Pope], so that he may be able to take action with regard to the indignity done to his See and to the setting at naught of the canons.
 
 

But we, bishops, answered him [Pope Vigilius]: "If your blessedness is willing to meet together with us and the most holy Patriarchs, and the most religious bishops, and to treat of the Three Chapters and to give, in unison with us all, a suitable form of the orthodox faith, as the Holy Apostles and the holy Fathers and the four Councils have done, we will hold thee as our head, as a [father] and primate...."
 
 

And that no one may be ignorant of this pious intention of yours, or suspect that we have been compelled by force, and have not freely consented to the carrying into effect of the imperial decrees touching the preaching of our evangelical faith which was addressed to our predecessor Donus, a pontiff of Apostolic memory, they have through our ministry been sent to and entirely approved by all nations and peoples...

Therefore, most Christian lords and sons, in accordance with the most pious jussio of your God-protected clemency, we have had a care to send, with the devotion of a prayerful heart (from the obedience we owe you, not because we relied on the [superabundant] knowledge of those whom we send to you), our fellow-servants here present, Abundantius, John, and John, our most reverend brother bishops, Theodore and George our most beloved sons and presbyters, with our most beloved son John, a deacon, and with Constantine, a subdeacon of this holy spiritual mother, the Apostolic See, as well as Theodore, the presbyter legate of the holy Church of Ravenna and the religious servants of God the monks. For, among men placed amid the Gentiles, and earning their daily bread by bodily labour with considerable distraction, how could a knowledge of the Scriptures, in its fulness, be found unless what has been canonically defined by our holy and apostolic predecessors, and by the venerable five councils, we preserve in simplicity of heart, and without any distorting keep the faith come to us from the Fathers, always desirous and endeavouring to possess that one and chiefest good, viz.: that nothing be diminished from the things canonically defined, and that nothing be changed nor added thereto, but that those same things, both in words and sense, be guarded untouched? To these same commissioners we also have given the witness of some of the holy Fathers, whom this Apostolic Church of Christ [i.e. Rome] receives, together with their books, so that, having obtained from the power of your most benign Christianity the privilege of suggesting, they might out of these endeavour to give satisfaction, (when your imperial Meekness shall have so commanded) as to what this Apostolic Church of Christ [Rome], their spiritual mother and the mother of your God-sprung empire, believes and preaches, not in words of worldly eloquence, which are not at the command of ordinary men, but in the integrity of the apostolic faith, in which having been taught from the cradle, we pray that we may serve and obey the Lord of heaven, the Propagator of your Christian empire, even unto the end. Consequently, we have granted them faculty or authority with your most tranquil mightiness, to afford satisfaction with simplicity whenever your clemency shall command, it being enjoined on them as a limitation that they presume not to add to, take away, or to change anything; but that they set forth this tradition of the Apostolic See in all sincerity as it has been taught by the apostolic pontiffs, who were our predecessors.

And briefly we shall intimate to your divinely instructed Piety, what the strength of our Apostolic faith contains, which we have received through Apostolic tradition and through the tradition of the Apostolical pontiffs, and that of the five holy general synods, through which the foundations of Christ's Catholic Church have been strengthened and established;

This is the apostolic and evangelic tradition, which the spiritual mother of your most felicitous empire, the Apostolic Church of Christ, holds. This is the pure expression of piety. This is the true and immaculate profession of the Christian religion, not invented by human cunning, but which was taught by the Holy Ghost through the princes of the Apostles.
[Does "princes of the Apostles" refer to the Popes, since they are the successors of Peter, and Peter is often called the "Prince of the Apostles"? Or perhaps Peter and Paul?]

And therefore I beseech you with a contrite heart and rivers of tears, with prostrated mind, deign to stretch forth your most clement right hand to the Apostolic doctrine which the co-worker of your pious labours, the blessed apostle Peter [is Pope Agatho referring to himself here?], has delivered, that it be not hidden under a bushel, but that it be preached in the whole earth more shrilly than a bugle: because the true confession thereof for which Peter was pronounced blessed by the Lord of all things, was revealed by the Father of heaven, for he received from the Redeemer of all himself, by three commendations, the duty of feeding the spiritual sheep of the Church; under whose protecting shield, this Apostolic Church of his [i.e. Rome] has never turned away from the path of truth in any direction of error, whose authority, as that of the Prince of all the Apostles, the whole Catholic Church, and the Ecumenical Synods have faithfully embraced, and followed in all things; and all the venerable Fathers have embraced its Apostolic doctrine, through which they as the most approved luminaries of the Church of Christ have shone; and the holy orthodox doctors have venerated and followed it, while the heretics have pursued it with false criminations and with derogatory hatred.

For this is the rule of the true faith, which this spiritual mother of your most tranquil empire, the Apostolic Church of Christ, has both in prosperity and in adversity always held and defended with energy; which, it will be proved, by the grace of Almighty God, has never erred from the path of the apostolic tradition, nor has she been depraved by yielding to heretical innovations, but from the beginning she has received the Christian faith from her founders, the princes of the Apostles of Christ, and remains undefiled unto the end, according to the divine promise of the Lord and Saviour himself, which he uttered in the holy Gospels to the prince of his disciples: saying, "Peter, Peter, behold, Satan hath desired to have you, that he might sift you as wheat; but I have prayed for thee, that (thy) faith fail not. And when thou art converted, strengthen thy brethren."  Let your tranquil Clemency therefore consider, since it is the Lord and Saviour of all, whose faith it is, that promised that Peter's faith should not fail and exhorted him to strengthen his brethren, how it is known to all that the Apostolic pontiffs, the predecessors of my littleness, have always confidently done this very thing: of whom also our littleness, since I have received this ministry by divine designation, wishes to be the follower, although unequal to them and the least of all. [What follows describes what Honorius was condemned for (a dereliction of the duty to "preach the truth"), which is not something that is prevented by Papal infallibility.]  For woe is me, if I neglect to preach the truth of my Lord, which they have sincerely preached. Woe is me, if I cover over with silence the truth which I am bidden to give to the exchangers, i.e., to teach to the Christian people and imbue it therewith. What shall I say in the future examination by Christ himself, if I blush (which God forbid!) to preach here the truth of his words? What satisfaction shall I be able to give for myself, what for the souls committed to me, when he demands a strict account of the office I have received?... Wherefore the predecessors of Apostolic memory of my littleness, learned in the doctrine of the Lord, ever since the prelates of the Church of Constantinople have been trying to introduce into the immaculate Church of Christ an heretical innovation, have never ceased to exhort and warn them with many prayers, that they should, at least by silence, desist from the heretical error of the depraved dogma, lest from this they make the beginning of a split in the unity of the Church...

Therefore the Holy Church of God, the mother of your most Christian power, should be delivered and liberated with all your might (through the help of God) from the errors of such teachers, and the evangelical and apostolic uprightness of the orthodox faith, which has been established upon the firm rock of this Church of blessed Peter, the Prince of the Apostles, which by his grace and guardianship remains free from all error, [that faith I say] the whole number of rulers and priests, of the clergy and of the people, unanimously should confess and preach with us as the true declaration of the Apostolic tradition, in order to please God and to save their own souls.

And indeed the apostolic predecessors of my humility admonished, begged, upbraided, besought, reproved, and exercised every kind of exhortation that the recent wound bright receive a remedy, moved thereto not by a mind filled with hatred (God is my witness) nor through the elation of boasting, nor through the opposition of contention, nor through an inane desire to find some fault with their teachings, nor through anything akin to the love of arrogance, but out of zeal for the uprightness of the truth, and for the rule of the confession of the pure Gospel, and for the salvation of souls, and for the stability of the Christian state, and for the safety of those who rule the Roman Empire. Nor did they cease from their admonitions after the long duration of this domesticated error, but always exhorted and bore record, and that with fraternal charity, not through malice or pertinacious hatred (far be it from the Christian heart to rejoice at another's fall, when the Lord of all teaches, "I desire not the death of a sinner, but that he be converted and live;" and who rejoiceth over one sinner that repenteth more than over ninety-and-nine just persons: who came down from heaven to earth to deliver the lost sheep, inclining the power of his majesty), but desiring them with outstretched spiritual arms, and exhorting to embrace them returning to the unity of the orthodox faith, and awaiting their conversion to the full rectitude of the orthodox faith: that they might not make themselves aliens from our communion, that is from the communion of blessed Peter the Apostle, whose ministry, we (though unworthy) exercise, and preach the faith he has handed down, but that they should together with us pray Christ the Lord, the spotless sacrifice, for the stability of your most strong and serene Empire.
 
 

[Latin version:]
But we, although most humble, yet strive with all our might that the commonwealth of your Christian empire may be shown to be more sublime than all the nations, for in it has been rounded the See of Blessed Peter, the prince of the Apostles, by the authority of which, all Christian nations venerate and worship with us, through the reverence of the blessed Apostle Peter himself.
[ending of the Greek version:]
... The authority of which for the truth, all the Christian nations together with us worship and revere, according to the honour of the blessed Peter the Apostle himself.
 
 

But the highest prince of the Apostles fought with us: for we had on our side his imitator and the successor in his see, who also had set forth in his letter the mystery of the divine word (qeolo giaV). For the ancient city of Rome handed thee a confession of divine character, and a chart from the sunsetting raised up the day of dogmas, and made the darkness manifest, and Peter spoke through Agatho....
 
 

Serious illnesses call for greater helps, as you know, most blessed [father]; and therefore Christ our true God, who is the creator and governing power of all things, gave a wise physician, namely your God-honoured sanctity, to drive away by force the contagion of heretical pestilence by the remedies of orthodoxy, and to give the strength of health to the members of the church. Therefore to thee, as to the bishop of the first see of the Universal Church, we leave what must be done, since you willingly take for your standing ground the firm rock of the faith, as we know from having read your true confession in the letter sent by your fatherly beatitude to the most pious emperor: and we acknowledge that this letter was divinely written (perscriptas) as by the Chief of the Apostles, and through it we have cast out the heretical sect of many errors which had recently sprung up...

For we cannot laugh at the fall of our neighbours, nor exult with joy at their unbridled madness, nor have we been elated that we might fall all the more grievously because of this thing; not thus, O venerable and sacred head, have we been taught...
 
 

They who receive the dignity of the empire, or the honour of the principal priesthood from our Lord Jesus Christ, ought to provide and to care for those things which please him, and rule and govern the people committed to their care according to his will and good pleasure.
Therefore, O most holy Head (Caput), it is incumbent upon us and you, that irreprehensibly we know the things which be his, and that in these we exercise ourselves, since from him we have received the imperatorial dignity, and you the dignity of the chief priesthood....

As then you are the veritable chief priest (primus sacerdos)who presides in the place and in the see of the holy and superlaudable Apostle Peter, let your paternal blessedness come to us, as we have said before, and add your presence to all those other priests who shall be assembled together here, that thus the will of the Lord may be accomplished.
 
 

We have received letters from Hadrian, most Holy Pope of old Rome, by his Legates -- namely, Peter, the God-beloved Archpresbyter, and Peter, the God-beloved Presbyter and Abbot -- who will be present in council with you; and we command that, according to synodical custom, these be read in the hearing of you all; and that, having heard these with becoming silence, and moreover the Epistles contained in two octavos sent by the Chief Priest and other Priests of the Eastern dioceses by John, most pious Monk and Chancellor of the Patriarchal throne of Antioch, and Thomas, Priest and Abbot, who also are present together with you, ye may by these understand what are the sentiments of the Church Catholic on this point.
 
 

If you persevere in that orthodox Faith in which you have begun, and the sacred and venerable images be by your means erected again in those parts, as by the lord, the Emperor Constantine of pious memory, and the blessed Helen, who promulgated the orthodox Faith, and exalted the holy Catholic and Apostolic Roman Church your spiritual mother, and with the other orthodox Emperors venerated it as the head of all Churches, so will your Clemency, that is protected of God, receive the name of another Constantine, and another Helen, through whom at the beginning the holy Catholic and Apostolic Church derived strength, and like whom your own imperial fame is spread abroad by triumphs, so as to be brilliant and deeply fixed in the whole world. But the more, if following the traditions of the orthodox Faith, you embrace the judgment of the Church of blessed Peter, chief of the Apostles, and, as of old your predecessors the holy Emperors acted, so you, too, venerating it with honour, love with all your heart his Vicar, and if your sacred majesty follow by preference their orthodox Faith, according to our holy Roman Church. May the chief of the Apostles himself, to whom the power was given by our Lord God to bind and remit sins in heaven and earth, be often your protector, and trample all barbarous nations under your feet, and everywhere make you conquerors. For let sacred authority lay open the marks of his dignity, and how great veneration ought to be shewn to his, the highest See, by all the faithful in the world. For the Lord set him who bears the keys of the kingdom of heaven as chief over all, and by Him is he honoured with this privilege, by which the keys of the kingdom of heaven are entrusted to him. He, therefore, that was preferred with so exalted an honour was thought worthy to confess that Faith on which the Church of Christ is rounded. A blessed reward followed that blessed confession, by the preaching of which the holy universal Church [this apparently refers to Rome] was illumined, and from it the other Churches of God have derived the proofs of Faith. For the blessed Peter himself, the chief of the Apostles, who first sat in the Apostolic See, left the chiefship of his Apostolate, and pastoral care, to his successors, who are to sit in his most holy seat for ever. And that power of authority, which he received from the Lord God our Saviour, he too bestowed and delivered by divine command to the Pontiffs, his successors, etc.
We greatly wondered that in your imperial commands, directed for the Patriarch of the royal city, Tarasius, we find him there called Universal: but we know not whether this was written through ignorance or schism, or the heresy of the wicked. But henceforth we advise your most merciful and imperial majesty, that he be by no means called Universal in your writings, because it appears to be contrary to the institutions of the holy Canons and the decrees of the traditions of the holy Fathers. For he never could have ranked second, save for the authority of our holy Catholic and Apostolic Church, as is plain to all. Because if he be named Universal, above the holy Roman Church which has a prior rank, which is the head of all the Churches of God, it is certain that he shews himself as a rebel against the holy Councils, and a heretic. For, if he is Universal, he is recognized to have the Primacy even over the Church of our See, which appears ridiculous to all faithful Christians: because in the whole world the chief rank and power was given to the blessed Apostle Peter by the Redeemer of the world himself; and through the same Apostle, whose place we unworthily hold, the holy Catholic and Apostolic Roman Church holds the first rank, and the authority of power, now and for ever, so that if any one, which we believe not, has called him, or assents to his being called Universal, let him know that he is estranged from the orthodox Faith, and a rebel against our holy Catholic and Apostolic Church.
 
 

If the ancient orthodoxy be perfected and restored by your means in those regions, and the venerable icons be placed in their original state, you will be partakers with the Lord Constantine, Emperor of old, now in the Divine keeping, and the Empress Helena, who made conspicuous and confirmed the orthodox Faith, and exalted still more your holy mother, the Catholic and Roman and spiritual Church, and with the orthodox Emperors who ruled after them, and so your most pious and heaven-protected name likewise will be set forth as that of another Constantine and another Helena, being renowned and praised through the whole world, by whom the holy Catholic and Apostolic Church is restored. And especially if you follow the tradition of the orthodox Faith of the Church of the holy Peter and Paul, the chief Apostles, and embrace their Vicar, as the Emperors who reigned before you of old both honoured their Vicar, and loved him with all their heart: and if your sacred majesty honour the most holy Roman Church of the chief Apostles, to whom was given power by God the Word himself to loose and to bind sins in heaven and earth. For they will extend their shield over your power, and all barbarous nations shall be put under your feet: and wherever you go they will make you conquerors. For the holy and chief Apostles themselves, who set up the Catholic and orthodox Faith, have laid it down as a written law that all who after them are to be successors of their seats, should hold their Faith and remain in it to the end.

[After the above letter had been read:]
Peter and Peter the most beloved-of-God presbyters who held the place of Hadrian, the most holy pope of Rome, said: We ourselves received such letters from our apostolic father and delivered them to the pious lords.

And when the most blessed Pope heard it, he said: Since this has come to pass in the days of their reign, God has magnified their pious rule above all former reigns. And this suggestion (anaforan) which has been read he sent to our most pious kings together with a letter to your holiness and with his vicars who are here present and presiding.

Tarasius the most holy patriarch said: The divine Apostle Paul, who was filled with the light of Christ, and who hath begotten us through the gospel, in writing to the Romans, commending their zeal for the true faith which they had in Christ our true God, thus said: "Your faith is gone forth into all the world." It is necessary to follow out this witness, and he that would contradict it is without good sense. Wherefore Hadrian, the ruler of Old Rome, since he was a sharer of these things, thus borne witness to, wrote expressly and truly to our religious Emperors, and to our humility, confirming admirably and beautifully the ancient tradition of the Catholic Church. ....